diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..ec31966
Binary files /dev/null and b/.DS_Store differ
diff --git a/week04/MyApplication/.gitignore b/week04/MyApplication/.gitignore
new file mode 100644
index 0000000..aa724b7
--- /dev/null
+++ b/week04/MyApplication/.gitignore
@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
diff --git a/week04/MyApplication/.idea/.gitignore b/week04/MyApplication/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/week04/MyApplication/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/week04/MyApplication/.idea/.name b/week04/MyApplication/.idea/.name
new file mode 100644
index 0000000..b3405b3
--- /dev/null
+++ b/week04/MyApplication/.idea/.name
@@ -0,0 +1 @@
+My Application
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/AndroidProjectSystem.xml b/week04/MyApplication/.idea/AndroidProjectSystem.xml
new file mode 100644
index 0000000..4a53bee
--- /dev/null
+++ b/week04/MyApplication/.idea/AndroidProjectSystem.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/compiler.xml b/week04/MyApplication/.idea/compiler.xml
new file mode 100644
index 0000000..b86273d
--- /dev/null
+++ b/week04/MyApplication/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/deploymentTargetSelector.xml b/week04/MyApplication/.idea/deploymentTargetSelector.xml
new file mode 100644
index 0000000..86eb009
--- /dev/null
+++ b/week04/MyApplication/.idea/deploymentTargetSelector.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-10-06T05:50:45.276799200Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="LocalEmulator" identifier="path=C:\Users\82102\.android\avd\Medium_Phone.avd" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
+      </SelectionState>
+      <SelectionState runConfigName="MainActivity">
+        <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-10-06T03:35:02.375997900Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=R3CT10M35YX" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
+      </SelectionState>
+      <SelectionState runConfigName="MainActivity (1)">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/deviceManager.xml b/week04/MyApplication/.idea/deviceManager.xml
new file mode 100644
index 0000000..91f9558
--- /dev/null
+++ b/week04/MyApplication/.idea/deviceManager.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DeviceTable">
+    <option name="columnSorters">
+      <list>
+        <ColumnSorterState>
+          <option name="column" value="Name" />
+          <option name="order" value="ASCENDING" />
+        </ColumnSorterState>
+      </list>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/gradle.xml b/week04/MyApplication/.idea/gradle.xml
new file mode 100644
index 0000000..639c779
--- /dev/null
+++ b/week04/MyApplication/.idea/gradle.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/migrations.xml b/week04/MyApplication/.idea/migrations.xml
new file mode 100644
index 0000000..f8051a6
--- /dev/null
+++ b/week04/MyApplication/.idea/migrations.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectMigrations">
+    <option name="MigrateToGradleLocalJavaHome">
+      <set>
+        <option value="$PROJECT_DIR$" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/misc.xml b/week04/MyApplication/.idea/misc.xml
new file mode 100644
index 0000000..4430e8c
--- /dev/null
+++ b/week04/MyApplication/.idea/misc.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+  <component name="VisualizationToolProject">
+    <option name="state">
+      <ProjectState>
+        <option name="scale" value="0.14658203125" />
+      </ProjectState>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.idea/runConfigurations.xml b/week04/MyApplication/.idea/runConfigurations.xml
new file mode 100644
index 0000000..16660f1
--- /dev/null
+++ b/week04/MyApplication/.idea/runConfigurations.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759721682891.log b/week04/MyApplication/.kotlin/errors/errors-1759721682891.log
new file mode 100644
index 0000000..07d5ca0
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759721682891.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759721738177.log b/week04/MyApplication/.kotlin/errors/errors-1759721738177.log
new file mode 100644
index 0000000..07d5ca0
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759721738177.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759721908289.log b/week04/MyApplication/.kotlin/errors/errors-1759721908289.log
new file mode 100644
index 0000000..07d5ca0
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759721908289.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759722080761.log b/week04/MyApplication/.kotlin/errors/errors-1759722080761.log
new file mode 100644
index 0000000..07d5ca0
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759722080761.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759722693172.log b/week04/MyApplication/.kotlin/errors/errors-1759722693172.log
new file mode 100644
index 0000000..07d5ca0
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759722693172.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759723751956.log b/week04/MyApplication/.kotlin/errors/errors-1759723751956.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759723751956.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759723774810.log b/week04/MyApplication/.kotlin/errors/errors-1759723774810.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759723774810.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759723950145.log b/week04/MyApplication/.kotlin/errors/errors-1759723950145.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759723950145.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759723989219.log b/week04/MyApplication/.kotlin/errors/errors-1759723989219.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759723989219.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759724016171.log b/week04/MyApplication/.kotlin/errors/errors-1759724016171.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759724016171.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759724034656.log b/week04/MyApplication/.kotlin/errors/errors-1759724034656.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759724034656.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759724071847.log b/week04/MyApplication/.kotlin/errors/errors-1759724071847.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759724071847.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759724211548.log b/week04/MyApplication/.kotlin/errors/errors-1759724211548.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759724211548.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759724271648.log b/week04/MyApplication/.kotlin/errors/errors-1759724271648.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759724271648.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759725645037.log b/week04/MyApplication/.kotlin/errors/errors-1759725645037.log
new file mode 100644
index 0000000..f0cec23
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759725645037.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:27:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759726116151.log b/week04/MyApplication/.kotlin/errors/errors-1759726116151.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759726116151.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759726301084.log b/week04/MyApplication/.kotlin/errors/errors-1759726301084.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759726301084.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759726870453.log b/week04/MyApplication/.kotlin/errors/errors-1759726870453.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759726870453.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759726955681.log b/week04/MyApplication/.kotlin/errors/errors-1759726955681.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759726955681.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759727049338.log b/week04/MyApplication/.kotlin/errors/errors-1759727049338.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759727049338.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759727491820.log b/week04/MyApplication/.kotlin/errors/errors-1759727491820.log
new file mode 100644
index 0000000..eb8c84b
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759727491820.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:36:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759727837125.log b/week04/MyApplication/.kotlin/errors/errors-1759727837125.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759727837125.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728075128.log b/week04/MyApplication/.kotlin/errors/errors-1759728075128.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728075128.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728092636.log b/week04/MyApplication/.kotlin/errors/errors-1759728092636.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728092636.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728106949.log b/week04/MyApplication/.kotlin/errors/errors-1759728106949.log
new file mode 100644
index 0000000..35ae3e9
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728106949.log
@@ -0,0 +1,76 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/DetailFragment.kt:22:5: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728133672.log b/week04/MyApplication/.kotlin/errors/errors-1759728133672.log
new file mode 100644
index 0000000..cdf6219
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728133672.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/LockerFragment.kt:29:77: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728489720.log b/week04/MyApplication/.kotlin/errors/errors-1759728489720.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728489720.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728494490.log b/week04/MyApplication/.kotlin/errors/errors-1759728494490.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728494490.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728564534.log b/week04/MyApplication/.kotlin/errors/errors-1759728564534.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728564534.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759728752787.log b/week04/MyApplication/.kotlin/errors/errors-1759728752787.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759728752787.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759729141048.log b/week04/MyApplication/.kotlin/errors/errors-1759729141048.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759729141048.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759729324543.log b/week04/MyApplication/.kotlin/errors/errors-1759729324543.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759729324543.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759729330205.log b/week04/MyApplication/.kotlin/errors/errors-1759729330205.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759729330205.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/.kotlin/errors/errors-1759729948001.log b/week04/MyApplication/.kotlin/errors/errors-1759729948001.log
new file mode 100644
index 0000000..b240a41
--- /dev/null
+++ b/week04/MyApplication/.kotlin/errors/errors-1759729948001.log
@@ -0,0 +1,120 @@
+kotlin version: 2.0.21
+error message: org.jetbrains.kotlin.util.FileAnalysisException: While analysing C:/Users/82102/AndroidStudioProjects/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt:28:75: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.util.AnalysisExceptionsKt.wrapIntoFileAnalysisExceptionIfNeeded(AnalysisExceptions.kt:57)
+	at org.jetbrains.kotlin.fir.FirCliExceptionHandler.handleExceptionOnFileAnalysis(Utils.kt:249)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:46)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.resolveAndCheckFir(firUtils.kt:77)
+	at org.jetbrains.kotlin.fir.pipeline.FirUtilsKt.buildResolveAndCheckFirViaLightTree(firUtils.kt:88)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModuleToAnalyzedFir(jvmCompilerPipeline.kt:319)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.compileModulesUsingFrontendIrAndLightTree(jvmCompilerPipeline.kt:118)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:148)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:103)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:49)
+	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:675)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:92)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1660)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
+	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
+	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
+	at java.base/java.lang.Thread.run(Unknown Source)
+Caused by: java.lang.IllegalArgumentException: source must not be null
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.requireNotNull(KtDiagnosticReportHelpers.kt:68)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn(KtDiagnosticReportHelpers.kt:39)
+	at org.jetbrains.kotlin.diagnostics.KtDiagnosticReportHelpersKt.reportOn$default(KtDiagnosticReportHelpers.kt:31)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkSourceElement(FirIncompatibleClassExpressionChecker.kt:50)
+	at org.jetbrains.kotlin.fir.analysis.checkers.expression.FirIncompatibleClassExpressionChecker.checkType$checkers(FirIncompatibleClassExpressionChecker.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.checkers.type.FirIncompatibleClassTypeChecker.check(FirIncompatibleClassTypeChecker.kt:17)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.check(TypeCheckersDiagnosticComponent.kt:81)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.components.TypeCheckersDiagnosticComponent.visitResolvedTypeRef(TypeCheckersDiagnosticComponent.kt:19)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.analysis.collectors.CheckerRunningDiagnosticCollectorVisitor.checkElement(CheckerRunningDiagnosticCollectorVisitor.kt:24)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:248)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitResolvedTypeRef(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.types.FirResolvedTypeRef.accept(FirResolvedTypeRef.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirAnonymousFunctionImpl.acceptChildren(FirAnonymousFunctionImpl.kt:70)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunction(AbstractDiagnosticCollectorVisitor.kt:141)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:134)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnonymousFunctionExpression(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirAnonymousFunctionExpression.accept(FirAnonymousFunctionExpression.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirSamConversionExpressionImpl.acceptChildren(FirSamConversionExpressionImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitSamConversionExpression(FirDefaultVisitor.kt:171)
+	at org.jetbrains.kotlin.fir.expressions.FirSamConversionExpression.accept(FirSamConversionExpression.kt:28)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList.acceptChildren(FirResolvedArgumentList.kt:35)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:53)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirVisitor.visitArgumentList(FirVisitor.kt:81)
+	at org.jetbrains.kotlin.fir.expressions.FirArgumentList.accept(FirArgumentList.kt:25)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:55)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirFunctionCallImpl.acceptChildren(FirFunctionCallImpl.kt:48)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitElement(AbstractDiagnosticCollectorVisitor.kt:49)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithCallOrAssignment(AbstractDiagnosticCollectorVisitor.kt:346)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:255)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFunctionCall(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirFunctionCall.accept(FirFunctionCall.kt:41)
+	at org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl.acceptChildren(FirBlockImpl.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:61)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitAnnotationContainer(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitStatement(FirDefaultVisitor.kt:33)
+	at org.jetbrains.kotlin.fir.visitors.FirDefaultVisitor.visitExpression(FirDefaultVisitor.kt:36)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:209)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitBlock(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.expressions.FirBlock.accept(FirBlock.kt:28)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirSimpleFunctionImpl.acceptChildren(FirSimpleFunctionImpl.kt:68)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:118)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitSimpleFunction(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirSimpleFunction.accept(FirSimpleFunction.kt:51)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirRegularClassImpl.acceptChildren(FirRegularClassImpl.kt:63)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitWithDeclarationAndReceiver(AbstractDiagnosticCollectorVisitor.kt:311)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitClassAndChildren(AbstractDiagnosticCollectorVisitor.kt:87)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:92)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitRegularClass(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirRegularClass.accept(FirRegularClass.kt:48)
+	at org.jetbrains.kotlin.fir.declarations.impl.FirFileImpl.acceptChildren(FirFileImpl.kt:57)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitNestedElements(AbstractDiagnosticCollectorVisitor.kt:38)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:1151)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollectorVisitor.visitFile(AbstractDiagnosticCollectorVisitor.kt:30)
+	at org.jetbrains.kotlin.fir.declarations.FirFile.accept(FirFile.kt:42)
+	at org.jetbrains.kotlin.fir.analysis.collectors.AbstractDiagnosticCollector.collectDiagnostics(AbstractDiagnosticCollector.kt:36)
+	at org.jetbrains.kotlin.fir.pipeline.AnalyseKt.runCheckers(analyse.kt:34)
+	... 33 more
+
+
diff --git a/week04/MyApplication/app/.gitignore b/week04/MyApplication/app/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/week04/MyApplication/app/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/week04/MyApplication/app/build.gradle.kts b/week04/MyApplication/app/build.gradle.kts
new file mode 100644
index 0000000..d7579ba
--- /dev/null
+++ b/week04/MyApplication/app/build.gradle.kts
@@ -0,0 +1,63 @@
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+}
+
+android {
+    namespace = "com.example.myapplication"
+    compileSdk = 36
+
+    buildFeatures {
+        viewBinding = true
+        dataBinding = true
+    }
+
+    defaultConfig {
+        applicationId = "com.example.myapplication"
+        minSdk = 24
+        targetSdk = 36
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+
+
+    implementation("com.google.android.material:material:1.12.0")
+
+    implementation(libs.androidx.activity)
+    implementation(libs.androidx.constraintlayout)
+
+
+    implementation("androidx.fragment:fragment-ktx:1.8.2")
+
+    implementation("androidx.viewpager2:viewpager2:1.1.0")
+    implementation("com.google.code.gson:gson:2.10.1")
+
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+}
diff --git a/week04/MyApplication/app/proguard-rules.pro b/week04/MyApplication/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/week04/MyApplication/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/androidTest/java/com/example/myapplication/ExampleInstrumentedTest.kt b/week04/MyApplication/app/src/androidTest/java/com/example/myapplication/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..e9283cf
--- /dev/null
+++ b/week04/MyApplication/app/src/androidTest/java/com/example/myapplication/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package com.example.myapplication
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.myapplication", appContext.packageName)
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/AndroidManifest.xml b/week04/MyApplication/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..da22304
--- /dev/null
+++ b/week04/MyApplication/app/src/main/AndroidManifest.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MyApplication">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".SongActivity"
+            android:exported="false" />
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/home-playstore.png b/week04/MyApplication/app/src/main/home-playstore.png
new file mode 100644
index 0000000..4fa989d
Binary files /dev/null and b/week04/MyApplication/app/src/main/home-playstore.png differ
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/Album.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/Album.kt
new file mode 100644
index 0000000..016d23f
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/Album.kt
@@ -0,0 +1,7 @@
+package com.example.myapplication
+import java.util.ArrayList
+data class Album(
+    var title: String?="",
+    var singer: String?="",
+    var coverImg: Int?=null,
+)
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt
new file mode 100644
index 0000000..623d495
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumFragment.kt
@@ -0,0 +1,73 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.myapplication.databinding.FragmentAlbumBinding
+import com.google.android.material.tabs.TabLayoutMediator
+import com.google.gson.Gson
+
+class AlbumFragment: Fragment() {
+
+    private var _binding: FragmentAlbumBinding? = null
+
+    private var songDatas= ArrayList<Song>()
+    private val binding get() = _binding!!
+    private var gson: Gson =Gson()
+
+    private val information = arrayListOf("수록곡", "상세정보", "영상")
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentAlbumBinding.inflate(inflater, container, false)
+
+        songDatas.apply {
+            add(Song("Lilac","IU"))
+            add(Song("Butter","방탄소년단(BTS)"))
+            add(Song("Next Level","에스파(AESPA)"))
+            add(Song("Boy with Luv","방탄소년단(BTS)"))
+            add(Song("BBoom BBoom","모모랜드(MONOLAND)"))
+            add(Song("Weekend","태연(Tea Yeon)"))
+            add(Song("Lilac","IU"))
+            add(Song("Butter","방탄소년단(BTS)"))
+            add(Song("Next Level","에스파(AESPA)"))
+            add(Song("Boy with Luv","방탄소년단(BTS)"))
+            add(Song("BBoom BBoom","모모랜드(MONOLAND)"))
+            add(Song("Weekend","태연(Tea Yeon)"))
+        }
+
+        val songRVAdapter= SongRVAdapter(songDatas)
+        binding.albumSongRv.adapter= songRVAdapter
+        binding.albumSongRv.layoutManager= LinearLayoutManager(context, LinearLayoutManager.VERTICAL,false)
+
+        val albumJson=arguments?.getString("album")
+        val album =gson.fromJson(albumJson,Album::class.java)
+        setInit(album)
+
+        val albumAdapter = AlbumVPAdapter(this)
+        binding.albumContentVp.adapter = albumAdapter
+
+        TabLayoutMediator(binding.albumContentTb, binding.albumContentVp) {
+        tab, position -> tab.text = information[position]
+        }.attach()
+
+        return binding.root
+    }
+
+    private fun setInit(album: Album){
+        binding.songLockerTitleImgIv.setImageResource(album.coverImg!!)
+        binding.songLockerTitle.text=album.title.toString()
+        binding.songLockerSinger.text=album.singer.toString()
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumRVAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumRVAdapter.kt
new file mode 100644
index 0000000..bfa8398
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumRVAdapter.kt
@@ -0,0 +1,44 @@
+package com.example.myapplication
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.constraintlayout.widget.ConstraintSet
+import androidx.recyclerview.widget.RecyclerView
+import com.example.myapplication.databinding.ItemAlbumBinding
+
+class AlbumRVAdapter(private val albumList: ArrayList<Album>): RecyclerView.Adapter<AlbumRVAdapter.ViewHolder>() {
+
+    interface MyItemClickListner{
+        fun onItemClick(album: Album)
+    }
+    private lateinit var mItemClickListner: MyItemClickListner
+    fun setMyItemClickListner(itemClickListner: MyItemClickListner){
+        mItemClickListner=itemClickListner
+    }
+
+    override fun onCreateViewHolder(
+        viewGroup: ViewGroup,
+        viewType: Int
+    ): AlbumRVAdapter.ViewHolder {
+        val binding: ItemAlbumBinding= ItemAlbumBinding.inflate(LayoutInflater.from(viewGroup.context),viewGroup,false)
+
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: AlbumRVAdapter.ViewHolder, position: Int) {
+        holder.bind(albumList[position])
+
+        holder.itemView.setOnClickListener { mItemClickListner.onItemClick(albumList[position]) }
+    }
+
+    override fun getItemCount(): Int=albumList.size
+
+    inner class ViewHolder(val binding: ItemAlbumBinding): RecyclerView.ViewHolder(binding.root){
+
+        fun bind(album: Album){
+            binding.itemAlbumTitleTv.text=album.title
+            binding.itemAlbumSingerTv.text=album.singer
+            binding.itemAlbumCoverImgIv.setImageResource(album.coverImg!!)
+        }
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumVPAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumVPAdapter.kt
new file mode 100644
index 0000000..e2e98b0
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/AlbumVPAdapter.kt
@@ -0,0 +1,16 @@
+package com.example.myapplication
+
+import androidx.fragment.app.Fragment
+import androidx.viewpager2.adapter.FragmentStateAdapter
+
+class AlbumVPAdapter(fragment: Fragment ): FragmentStateAdapter(fragment) {
+    override fun getItemCount(): Int=3
+
+    override fun createFragment(position: Int): Fragment {
+        return when(position){
+            0-> SongFragment()
+            1-> DetailFragment()
+            else-> VideoFragment()
+        }
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/DetailFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/DetailFragment.kt
new file mode 100644
index 0000000..874c0cf
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/DetailFragment.kt
@@ -0,0 +1,26 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentDetailBinding
+
+class DetailFragment: Fragment() {
+    private var _binding: FragmentDetailBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        _binding= FragmentDetailBinding.inflate(inflater,container,false)
+        return binding.root
+    }
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/HomeFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/HomeFragment.kt
new file mode 100644
index 0000000..469fb7d
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/HomeFragment.kt
@@ -0,0 +1,63 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.renderscript.ScriptGroup
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.viewpager2.widget.ViewPager2
+import com.example.myapplication.databinding.FragmentHomeBinding
+import com.google.gson.Gson
+
+class HomeFragment : Fragment(R.layout.fragment_home) {
+    private var albumDatas=ArrayList<Album>()
+
+    private var _binding: FragmentHomeBinding? = null
+    private val binding get() = _binding!!
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        _binding = FragmentHomeBinding.bind(view)
+
+        albumDatas.apply{
+            add(Album(title="Butter", singer = "방탄소년단(BTS)", R.drawable.img_album_exp))
+            add(Album(title = "Lilac","아이유(IU)",R.drawable.img_album_exp2))
+            add(Album("Next Level","에스파(AESPA)",R.drawable.img_album_exp3))
+            add(Album("Boy with Luv","방탄소년단(BTS)",R.drawable.img_album_exp4))
+            add(Album("BBoom BBoom","모모랜드(MOMOLAND",R.drawable.img_album_exp5))
+            add(Album("Weekend","태연(Tea Yeon)",R.drawable.img_album_exp6))
+        }
+
+        val albumRVAdapter= AlbumRVAdapter(albumDatas)
+        binding.homeTodayMusicAlbumRv.adapter=albumRVAdapter
+        binding.homeTodayMusicAlbumRv.layoutManager= LinearLayoutManager(context,
+            LinearLayoutManager.HORIZONTAL,false)
+
+        albumRVAdapter.setMyItemClickListner(object : AlbumRVAdapter.MyItemClickListner{
+            override fun onItemClick(album: Album) {
+                (context as MainActivity).supportFragmentManager.beginTransaction()
+                    .replace(R.id.main_container, AlbumFragment().apply {
+                        arguments= Bundle().apply {
+                            val gson= Gson()
+                            val albumJson=gson.toJson(album)
+                            putString("album",albumJson)
+                        }
+                    })
+                    .commitAllowingStateLoss()
+            }
+        })
+        
+        val adapter = PannelVPAdapter(childFragmentManager, viewLifecycleOwner.lifecycle)
+        adapter.addFragment(PannelFragment())
+        binding.homePannelVp.adapter = adapter
+        binding.homePannelVp.orientation = ViewPager2.ORIENTATION_HORIZONTAL
+
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerFragment.kt
new file mode 100644
index 0000000..fc7a65e
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerFragment.kt
@@ -0,0 +1,59 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.myapplication.databinding.FragmentLockerBinding
+import com.google.android.material.tabs.TabLayoutMediator
+
+class LockerFragment : Fragment() {
+    private var _binding: FragmentLockerBinding?=null
+    private var SavedSongDatas=ArrayList<SavedSong>()
+    private val binding get()=_binding!!
+    private val information = arrayListOf("저장한곡", "음악파일", "저장앨범")
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentLockerBinding.inflate(inflater, container, false)
+
+        SavedSongDatas.apply{
+            add(SavedSong(title="Butter", singer = "방탄소년단(BTS)", R.drawable.img_album_exp))
+            add(SavedSong(title = "Lilac","아이유(IU)",R.drawable.img_album_exp2))
+            add(SavedSong("Next Level","에스파(AESPA)",R.drawable.img_album_exp3))
+            add(SavedSong("Boy with Luv","방탄소년단(BTS)",R.drawable.img_album_exp4))
+            add(SavedSong("BBoom BBoom","모모랜드(MOMOLAND",R.drawable.img_album_exp5))
+            add(SavedSong("Weekend","태연(Tea Yeon)",R.drawable.img_album_exp6))
+            add(SavedSong(title="Butter", singer = "방탄소년단(BTS)", R.drawable.img_album_exp))
+            add(SavedSong(title = "Lilac","아이유(IU)",R.drawable.img_album_exp2))
+            add(SavedSong("Next Level","에스파(AESPA)",R.drawable.img_album_exp3))
+            add(SavedSong("Boy with Luv","방탄소년단(BTS)",R.drawable.img_album_exp4))
+            add(SavedSong("BBoom BBoom","모모랜드(MOMOLAND",R.drawable.img_album_exp5))
+            add(SavedSong("Weekend","태연(Tea Yeon)",R.drawable.img_album_exp6))
+        }
+
+        val lockerRVAdapter= LockerRVAdapter(SavedSongDatas)
+        binding.lockerSongRv.adapter=lockerRVAdapter
+        binding.lockerSongRv.layoutManager= LinearLayoutManager(context, LinearLayoutManager.VERTICAL,false)
+
+        
+
+        val lockerAdapter = LockerVPAdapter(this)
+        binding.lockerContentVp.adapter = lockerAdapter
+
+        TabLayoutMediator(binding.lockerContentTb, binding.lockerContentVp) { tab, position ->
+            tab.text = information[position]
+        }.attach()
+
+        return binding.root
+    }
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerRVAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerRVAdapter.kt
new file mode 100644
index 0000000..67185da
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerRVAdapter.kt
@@ -0,0 +1,51 @@
+package com.example.myapplication
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.example.myapplication.databinding.FragmentLockerTracksBinding
+
+class LockerRVAdapter (private val lockList: ArrayList<SavedSong>): RecyclerView.Adapter<LockerRVAdapter.ViewHolder>(){
+    override fun onCreateViewHolder(
+        viewGroup: ViewGroup,
+        viewType: Int
+    ): LockerRVAdapter.ViewHolder {
+        val binding: FragmentLockerTracksBinding= FragmentLockerTracksBinding.inflate(LayoutInflater.from(viewGroup.context),viewGroup,false)
+
+        return ViewHolder(binding)
+    }
+
+    interface MyItemClickListener{
+        fun onRemoveLocker(positon:Int)
+    }
+
+    private lateinit var mItemClickListener: MyItemClickListener
+    fun setMyItemClickListener(itemClickListener: MyItemClickListener){
+        mItemClickListener=itemClickListener
+    }
+    fun addItem(savedsong: SavedSong){
+        lockList.add(savedsong)
+        notifyDataSetChanged()
+    }
+
+    fun removeItem(positon:Int){
+        lockList.removeAt(positon)
+        notifyDataSetChanged()
+    }
+
+    override fun onBindViewHolder(holder: LockerRVAdapter.ViewHolder, position: Int) {
+        holder.bind(lockList[position])
+        holder.binding.lockerTrackMoreImg.setOnClickListener { {mItemClickListener.onRemoveLocker(position)} }
+    }
+
+    override fun getItemCount(): Int = lockList.size
+
+    inner class ViewHolder(val binding: FragmentLockerTracksBinding): RecyclerView.ViewHolder(binding.root){
+        fun bind(savedsong: SavedSong){
+            binding.itemLockerTitleTv.text=savedsong.title
+            binding.itemLockerSingerTv.text=savedsong.singer
+            binding.lockerTrackImg.setImageResource(savedsong.coverImg!!)
+    }
+
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerVPAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerVPAdapter.kt
new file mode 100644
index 0000000..4c6a304
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/LockerVPAdapter.kt
@@ -0,0 +1,18 @@
+package com.example.myapplication
+
+import androidx.fragment.app.Fragment
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import com.example.myapplication.databinding.FragmentLockerMusicfileBinding
+
+class LockerVPAdapter (fragment : Fragment) : FragmentStateAdapter(fragment) {
+    override fun getItemCount(): Int  = 3
+
+
+    override fun createFragment(position: Int): Fragment {
+        return when(position){
+            0 -> SavedSongFragment()
+            1-> MusicFileFragment()
+            else -> SavedAlbumFragment()
+        }
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/LookFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/LookFragment.kt
new file mode 100644
index 0000000..0b5f7de
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/LookFragment.kt
@@ -0,0 +1,28 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentLookBinding
+import com.google.android.material.tabs.TabLayoutMediator
+
+class LookFragment : Fragment() {
+    private var _binding: FragmentLookBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentLookBinding.inflate(inflater, container, false)
+
+        return binding.root
+    }
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/MainActivity.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/MainActivity.kt
new file mode 100644
index 0000000..26b0bf6
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/MainActivity.kt
@@ -0,0 +1,72 @@
+package com.example.myapplication
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.commit
+import com.example.myapplication.databinding.MainActivityBinding
+import com.google.android.material.bottomnavigation.BottomNavigationView
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var binding: MainActivityBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = MainActivityBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        fun openSong() {
+            val title = binding.homeMiniPlayerTitle.text.toString()
+            val singer = binding.homeMiniPlayerSinger.text.toString()
+            startActivity(Intent(this, SongActivity::class.java).apply {
+                putExtra("title", title)
+                putExtra("singer", singer)
+            })
+        }
+        binding.homeMiniPlayer.setOnClickListener { openSong() }
+        binding.homeMiniPlayerTitle.setOnClickListener { openSong() }
+        binding.homeMiniPlayerSinger.setOnClickListener { openSong() }
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.main_container, HomeFragment())
+            .commitAllowingStateLoss()
+        setupBottomNavigation()
+        findViewById<BottomNavigationView>(R.id.home_bottom_navigation)
+            .selectedItemId = R.id.menu_home
+    }
+    private fun setupBottomNavigation() {
+        val bottomNav = findViewById<BottomNavigationView>(R.id.home_bottom_navigation)
+
+        bottomNav.setOnItemSelectedListener { item ->
+            when (item.itemId) {
+                R.id.menu_home -> {
+                    supportFragmentManager.beginTransaction()
+                        .replace(R.id.main_container, HomeFragment())
+                        .commitAllowingStateLoss()
+                    true
+                }
+                R.id.menu_look -> {   // 메뉴 xml에 실제로 이 id가 있어야 함
+                    supportFragmentManager.beginTransaction()
+                        .replace(R.id.main_container, LookFragment())
+                        .commitAllowingStateLoss()
+                    true
+                }
+                R.id.menu_search -> {
+                    supportFragmentManager.beginTransaction()
+                        .replace(R.id.main_container, SearchFragment())
+                        .commitAllowingStateLoss()
+                    true
+                }
+                R.id.menu_locker -> {
+                    supportFragmentManager.beginTransaction()
+                        .replace(R.id.main_container, LockerFragment())
+                        .commitAllowingStateLoss()
+                    true
+                }
+                else -> false
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/MusicFileFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/MusicFileFragment.kt
new file mode 100644
index 0000000..ca33bad
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/MusicFileFragment.kt
@@ -0,0 +1,21 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentLockerMusicfileBinding
+import com.example.myapplication.databinding.FragmentVideoBinding
+
+class MusicFileFragment: Fragment() {
+
+    private var _binding: FragmentLockerMusicfileBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        _binding = FragmentLockerMusicfileBinding.inflate(inflater, container, false)
+
+        return binding.root
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelFragment.kt
new file mode 100644
index 0000000..7caa389
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelFragment.kt
@@ -0,0 +1,25 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentPannelBinding
+
+class PannelFragment : Fragment(){
+
+    lateinit var binding: FragmentPannelBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        binding= FragmentPannelBinding.inflate(inflater,container,false)
+
+        return binding.root
+    }
+}
+
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelVPAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelVPAdapter.kt
new file mode 100644
index 0000000..45ba440
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/PannelVPAdapter.kt
@@ -0,0 +1,23 @@
+package com.example.myapplication
+
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.lifecycle.Lifecycle
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import java.util.ArrayList
+
+class PannelVPAdapter(
+    fragmentManager: FragmentManager, lifecycle: Lifecycle
+) : FragmentStateAdapter(/* fragmentManager = */ fragmentManager, /* lifecycle = */ lifecycle) {
+
+    private val fragmentlist: ArrayList<Fragment> =ArrayList()
+
+    override fun getItemCount(): Int = fragmentlist.size
+
+    override fun createFragment(position: Int): Fragment =fragmentlist[position]
+
+    fun addFragment(fragment: Fragment){
+        fragmentlist.add(fragment)
+        notifyItemInserted(fragmentlist.size-1)
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedAlbumFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedAlbumFragment.kt
new file mode 100644
index 0000000..81534d4
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedAlbumFragment.kt
@@ -0,0 +1,21 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentLockerSavedalbumBinding
+import com.example.myapplication.databinding.FragmentVideoBinding
+
+class SavedAlbumFragment: Fragment() {
+
+    private var _binding: FragmentLockerSavedalbumBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        _binding = FragmentLockerSavedalbumBinding.inflate(inflater, container, false)
+
+        return binding.root
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSong.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSong.kt
new file mode 100644
index 0000000..a7afcc2
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSong.kt
@@ -0,0 +1,7 @@
+package com.example.myapplication
+
+data class SavedSong(
+    var title: String?="",
+    var singer: String?="",
+    var coverImg: Int?=null,
+)
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSongFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSongFragment.kt
new file mode 100644
index 0000000..4f6cac0
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SavedSongFragment.kt
@@ -0,0 +1,30 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.myapplication.databinding.FragmentLockerSavedsongBinding
+
+class SavedSongFragment : Fragment() {
+    private var _binding: FragmentLockerSavedsongBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        _binding = FragmentLockerSavedsongBinding.inflate(inflater, container, false)
+
+        return binding.root
+    }
+
+    override fun onStart() {
+        super.onStart()
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SearchFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SearchFragment.kt
new file mode 100644
index 0000000..7aee81b
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SearchFragment.kt
@@ -0,0 +1,28 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentSearchBinding
+import com.google.android.material.tabs.TabLayoutMediator
+
+class SearchFragment : Fragment() {
+    private var _binding: FragmentSearchBinding?=null
+    private val binding get()=_binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentSearchBinding.inflate(inflater, container, false)
+
+        return binding.root
+    }
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/Song.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/Song.kt
new file mode 100644
index 0000000..a5bcb94
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/Song.kt
@@ -0,0 +1,6 @@
+package com.example.myapplication
+
+data class Song(
+    var title: String?="",
+    var singer: String?=""
+)
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SongActivity.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongActivity.kt
new file mode 100644
index 0000000..0b128e2
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongActivity.kt
@@ -0,0 +1,37 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import com.example.myapplication.databinding.SongActivityBinding
+
+class SongActivity : AppCompatActivity() {
+    lateinit var binding: SongActivityBinding
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = SongActivityBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        if (intent.hasExtra("title") && intent.hasExtra("singer")) {
+            binding.songActivityTitle.text = intent.getStringExtra("title")
+            binding.songActivitySinger.text = intent.getStringExtra("singer")
+        }
+    }
+
+    private fun setPlayerStatus (isPlaying : Boolean){
+
+        if(isPlaying){
+            // 재생 상태일 때
+            binding.songActivityPlayPlayerImgIv.visibility = View.GONE
+            //binding.songPauseIv.visibility = View.VISIBLE
+        } else {
+            // 일시정지 상태일 때
+            binding.songActivityPlayPlayerImgIv.visibility = View.VISIBLE
+            //binding.songPauseIv.visibility = View.GONE
+
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SongFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongFragment.kt
new file mode 100644
index 0000000..c4ffad9
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongFragment.kt
@@ -0,0 +1,21 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentSongBinding
+
+class SongFragment: Fragment() {
+    lateinit var binding: FragmentSongBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding= FragmentSongBinding.inflate(inflater,container,false)
+        return binding.root
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/SongRVAdapter.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongRVAdapter.kt
new file mode 100644
index 0000000..a580b6b
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/SongRVAdapter.kt
@@ -0,0 +1,32 @@
+package com.example.myapplication
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.example.myapplication.databinding.FragmentDetailBinding
+import com.example.myapplication.databinding.FragmentSongBinding
+
+class SongRVAdapter(private val songList: ArrayList<Song>): RecyclerView.Adapter<SongRVAdapter.ViewHolder>(){
+    override fun onCreateViewHolder(
+        viewGroup: ViewGroup,
+        viewType: Int
+    ): SongRVAdapter.ViewHolder {
+        val binding: FragmentSongBinding= FragmentSongBinding.inflate(LayoutInflater.from(viewGroup.context), viewGroup,false)
+
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: SongRVAdapter.ViewHolder, position: Int) {
+        holder.bind(songList[position])
+    }
+
+    override fun getItemCount(): Int = songList.size
+
+    inner class ViewHolder(val binding: FragmentSongBinding): RecyclerView.ViewHolder(binding.root){
+
+        fun bind(song:Song){
+            binding.itemAlbumTitleTv.text=song.title
+            binding.itemAlbumSingerTv.text=song.singer
+        }
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/java/com/example/myapplication/VideoFragment.kt b/week04/MyApplication/app/src/main/java/com/example/myapplication/VideoFragment.kt
new file mode 100644
index 0000000..6c37384
--- /dev/null
+++ b/week04/MyApplication/app/src/main/java/com/example/myapplication/VideoFragment.kt
@@ -0,0 +1,21 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.example.myapplication.databinding.FragmentVideoBinding
+
+class VideoFragment: Fragment() {
+    lateinit var binding: FragmentVideoBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding= FragmentVideoBinding.inflate(inflater,container,false)
+        return binding.root
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_actionbar_instagram.png b/week04/MyApplication/app/src/main/res/drawable/btn_actionbar_instagram.png
new file mode 100644
index 0000000..90bc027
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_main_arrow_more.png b/week04/MyApplication/app/src/main/res/drawable/btn_main_arrow_more.png
new file mode 100644
index 0000000..59e410c
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_main_mike.png b/week04/MyApplication/app/src/main/res/drawable/btn_main_mike.png
new file mode 100644
index 0000000..9bddec6
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_main_setting.png b/week04/MyApplication/app/src/main/res/drawable/btn_main_setting.png
new file mode 100644
index 0000000..7a8d5d6
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_main_ticket.png b/week04/MyApplication/app/src/main/res/drawable/btn_main_ticket.png
new file mode 100644
index 0000000..52b6d64
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_miniplay_pause.png b/week04/MyApplication/app/src/main/res/drawable/btn_miniplay_pause.png
new file mode 100644
index 0000000..470e046
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_go_list.png b/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_go_list.png
new file mode 100644
index 0000000..1b2d977
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_next.png b/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_next.png
new file mode 100644
index 0000000..3aedba3
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_play.png b/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_play.png
new file mode 100644
index 0000000..f619072
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_previous.png b/week04/MyApplication/app/src/main/res/drawable/btn_miniplayer_previous.png
new file mode 100644
index 0000000..d0bf1f6
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_panel_play_large.png b/week04/MyApplication/app/src/main/res/drawable/btn_panel_play_large.png
new file mode 100644
index 0000000..4ac7103
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_player_more.png b/week04/MyApplication/app/src/main/res/drawable/btn_player_more.png
new file mode 100644
index 0000000..a8ad9e6
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/btn_player_more.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_player_play.png b/week04/MyApplication/app/src/main/res/drawable/btn_player_play.png
new file mode 100644
index 0000000..f6c3201
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_player_related.png b/week04/MyApplication/app/src/main/res/drawable/btn_player_related.png
new file mode 100644
index 0000000..9026fe5
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_player_setting.png b/week04/MyApplication/app/src/main/res/drawable/btn_player_setting.png
new file mode 100644
index 0000000..0df8f69
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_player_unlike_off.png b/week04/MyApplication/app/src/main/res/drawable/btn_player_unlike_off.png
new file mode 100644
index 0000000..b539504
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diff --git a/week04/MyApplication/app/src/main/res/drawable/btn_playlist_select_off.png b/week04/MyApplication/app/src/main/res/drawable/btn_playlist_select_off.png
new file mode 100644
index 0000000..62ef45c
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/btn_playlist_select_off.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_bottom_home_no_select.png b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_home_no_select.png
new file mode 100644
index 0000000..69a8ab6
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_home_no_select.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_bottom_locker_no_select.png b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_locker_no_select.png
new file mode 100644
index 0000000..a67dec3
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diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_bottom_look_no_select.png b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_look_no_select.png
new file mode 100644
index 0000000..6c2f4f0
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diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_bottom_search_no_select.png b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_search_no_select.png
new file mode 100644
index 0000000..a77b8c5
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/ic_bottom_search_no_select.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_launcher_foreground.xml b/week04/MyApplication/app/src/main/res/drawable/ic_launcher_foreground.xml
new file mode 100644
index 0000000..2b068d1
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/drawable/ic_my_like_off.png b/week04/MyApplication/app/src/main/res/drawable/ic_my_like_off.png
new file mode 100644
index 0000000..c06e139
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/ic_my_like_off.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/icon_browse_arrow_right.png b/week04/MyApplication/app/src/main/res/drawable/icon_browse_arrow_right.png
new file mode 100644
index 0000000..71b588b
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/icon_browse_arrow_right.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp.png b/week04/MyApplication/app/src/main/res/drawable/img_album_exp.png
new file mode 100644
index 0000000..6e3f38a
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp2.png b/week04/MyApplication/app/src/main/res/drawable/img_album_exp2.png
new file mode 100644
index 0000000..28ea3ee
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp2.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp3.jpg b/week04/MyApplication/app/src/main/res/drawable/img_album_exp3.jpg
new file mode 100644
index 0000000..6641600
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp3.jpg differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp4.jpg b/week04/MyApplication/app/src/main/res/drawable/img_album_exp4.jpg
new file mode 100644
index 0000000..aecebb6
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp4.jpg differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp5.jpg b/week04/MyApplication/app/src/main/res/drawable/img_album_exp5.jpg
new file mode 100644
index 0000000..6a8d870
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp5.jpg differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_album_exp6.jpg b/week04/MyApplication/app/src/main/res/drawable/img_album_exp6.jpg
new file mode 100644
index 0000000..48202f2
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_album_exp6.jpg differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/img_first_album_default.png b/week04/MyApplication/app/src/main/res/drawable/img_first_album_default.png
new file mode 100644
index 0000000..926d34f
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/img_first_album_default.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/nugu_btn_down.png b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_down.png
new file mode 100644
index 0000000..03a04c5
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_down.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/nugu_btn_random_inactive.png b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_random_inactive.png
new file mode 100644
index 0000000..fe4f880
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_random_inactive.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/nugu_btn_repeat_inactive.png b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_repeat_inactive.png
new file mode 100644
index 0000000..1e4044d
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_repeat_inactive.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_next_32.png b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_next_32.png
new file mode 100644
index 0000000..fc02f28
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_next_32.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_previous_32.png b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_previous_32.png
new file mode 100644
index 0000000..03ec854
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/nugu_btn_skip_previous_32.png differ
diff --git a/week04/MyApplication/app/src/main/res/drawable/widget_black_play.png b/week04/MyApplication/app/src/main/res/drawable/widget_black_play.png
new file mode 100644
index 0000000..0ec2700
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/drawable/widget_black_play.png differ
diff --git a/week04/MyApplication/app/src/main/res/layout/bottom_nav.xml b/week04/MyApplication/app/src/main/res/layout/bottom_nav.xml
new file mode 100644
index 0000000..90fb28d
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/bottom_nav.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.bottomnavigation.BottomNavigationView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/home_bottom_navigation"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    app:labelVisibilityMode="labeled"
+    app:menu="@menu/bottom_nav_menu"/>
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_album.xml b/week04/MyApplication/app/src/main/res/layout/fragment_album.xml
new file mode 100644
index 0000000..9fac119
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_album.xml
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/song_locker_arrow_img_iv"
+        android:layout_width="35dp"
+        android:layout_height="35dp"
+        android:src="@drawable/btn_main_arrow_more"
+        android:layout_marginTop="15dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginStart="10dp"
+        android:rotation="180"
+        app:tint="@color/black"
+        />
+
+    <ImageView
+        android:id="@+id/song_locker_like"
+        android:src="@drawable/ic_my_like_off"
+        android:layout_width="35dp"
+        android:layout_height="35dp"
+        app:layout_constraintEnd_toStartOf="@id/song_locker_more_img_iv"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginEnd="10dp"
+        android:layout_marginTop="20dp"
+        />
+
+    <ImageView
+        android:id="@+id/song_locker_more_img_iv"
+        android:layout_width="35dp"
+        android:layout_height="35dp"
+        android:src="@drawable/btn_player_more"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="15dp"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="20dp"/>
+
+    <TextView
+        android:id="@+id/song_locker_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Pop Song"
+        android:textSize="22dp"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toTopOf="@id/song_locker_title_img_iv"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginBottom="37dp"/>
+
+    <TextView
+        android:id="@+id/song_locker_singer"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Kenshi Yonezu"
+        android:textSize="13dp"
+        android:textStyle="bold"
+        android:textColor="@color/lightgray"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/song_locker_title_img_iv"
+        android:layout_marginBottom="15dp"/>
+
+    <TextView
+        android:id="@+id/song_locker_information"
+        android:layout_width="50dp"
+        android:layout_height="16dp"
+        android:layout_marginBottom="0dp"
+        android:text="앨범정보"
+        android:textColor="@color/lightgray"
+        android:textSize="13dp"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toTopOf="@id/song_locker_title_img_iv"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        />
+
+    <ImageView
+        android:id="@+id/song_locker_title_img_iv"
+        android:layout_width="175dp"
+        android:layout_height="200dp"
+        android:layout_marginTop="110dp"
+        android:src="@drawable/img_album_exp2"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.tabs.TabLayout
+        android:id="@+id/album_content_tb"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="@id/song_locker_title_img_iv"
+        app:layout_constraintStart_toStartOf="@id/song_locker_title_img_iv"
+        app:layout_constraintTop_toBottomOf="@id/song_locker_title_img_iv" />
+
+        <androidx.viewpager2.widget.ViewPager2
+        android:id="@+id/album_content_vp"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/album_content_tb"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/album_song_rv"
+            android:layout_width="match_parent"
+            android:layout_height="400dp"
+            android:clipToPadding="false"
+            android:paddingBottom="@dimen/space_for_bottom_bars"
+            tools:layout_editor_absoluteX="0dp"
+            app:layout_constraintTop_toBottomOf="@id/album_content_tb"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_detail.xml b/week04/MyApplication/app/src/main/res/layout/fragment_detail.xml
new file mode 100644
index 0000000..3d7d033
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_detail.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="이 앨범의 이름은 Lost corner 입니다. 이 앨범의 작곡가는 Kenshi Yonezu 입니다."
+        android:textSize="30sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_home.xml b/week04/MyApplication/app/src/main/res/layout/fragment_home.xml
new file mode 100644
index 0000000..1e495dd
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_home.xml
@@ -0,0 +1,210 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:clipToPadding="false"
+    android:paddingBottom="@dimen/space_for_bottom_bars">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+            <!--        <ImageView-->
+            <!--            android:id="@+id/home_pannel_background_iv"-->
+            <!--            android:layout_width="match_parent"-->
+            <!--            android:layout_height="400dp"-->
+            <!--            android:scaleType="centerCrop"-->
+            <!--            android:src="@drawable/img_first_album_default"-->
+            <!--            app:layout_constraintEnd_toEndOf="parent"-->
+            <!--            app:layout_constraintStart_toStartOf="parent"-->
+            <!--            app:layout_constraintTop_toTopOf="parent" />-->
+
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/home_today_music_album_rv"
+                android:layout_width="match_parent"
+                android:layout_height="210dp"
+                android:layout_marginTop="80dp"
+                app:layout_constraintTop_toBottomOf="@+id/home_pannel_album_img_iv"/>
+
+
+            <androidx.viewpager2.widget.ViewPager2
+                android:id="@+id/home_pannel_vp"
+                android:layout_width="match_parent"
+                android:layout_height="400dp"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <ImageView
+                android:id="@+id/home_pannel_bnt_mike_iv"
+                android:layout_width="35dp"
+                android:layout_height="35dp"
+                android:layout_marginTop="20dp"
+                android:layout_marginEnd="15dp"
+                android:src="@drawable/btn_main_mike"
+                app:layout_constraintEnd_toStartOf="@id/home_pannel_bnt_ticket_iv"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <ImageView
+                android:id="@+id/home_pannel_bnt_ticket_iv"
+                android:layout_width="35dp"
+                android:layout_height="35dp"
+                android:layout_marginTop="20dp"
+                android:layout_marginEnd="15dp"
+                android:src="@drawable/btn_main_ticket"
+                app:layout_constraintEnd_toStartOf="@id/home_pannel_bnt_setting_iv"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <ImageView
+                android:id="@+id/home_pannel_bnt_setting_iv"
+                android:layout_width="35dp"
+                android:layout_height="35dp"
+                android:layout_marginTop="20dp"
+                android:layout_marginEnd="15dp"
+                android:src="@drawable/btn_main_setting"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <TextView
+                android:id="@+id/home_pannel_title_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="20dp"
+                android:layout_marginTop="15dp"
+                android:text="달밤의 감성 산책"
+                android:textColor="@color/white"
+                android:textSize="28sp"
+                android:textStyle="bold"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/home_pannel_bnt_setting_iv" />
+
+            <ImageView
+                android:id="@+id/home_pannel_btn_play_iv"
+                android:layout_width="60dp"
+                android:layout_height="60dp"
+                android:layout_marginTop="15dp"
+                android:layout_marginEnd="20dp"
+                android:src="@drawable/btn_panel_play_large"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/home_pannel_bnt_mike_iv" />
+
+            <TextView
+                android:id="@+id/home_pannel_album_info_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="20dp"
+                android:layout_marginBottom="12dp"
+                android:text="총 10곡 2025.03.30"
+                android:textColor="@color/white"
+                android:textSize="13sp"
+                app:layout_constraintBottom_toTopOf="@+id/home_pannel_album1_img_iv"
+                app:layout_constraintStart_toStartOf="parent" />
+
+            <ImageView
+                android:id="@+id/home_pannel_album1_img_iv"
+                android:layout_width="40dp"
+                android:layout_height="40dp"
+                android:layout_marginStart="20dp"
+                android:layout_marginBottom="16dp"
+                android:src="@drawable/img_album_exp"
+                app:layout_constraintBottom_toTopOf="@id/home_pannel_album_img_iv"
+                app:layout_constraintStart_toStartOf="parent" />
+
+            <TextView
+                android:id="@+id/home_pannel_album1_title_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="15dp"
+                android:text="In My Bed"
+                android:textColor="@color/white"
+                android:textStyle="bold"
+                app:layout_constraintBottom_toTopOf="@+id/home_pannel_album1_singer_tv"
+                app:layout_constraintStart_toEndOf="@id/home_pannel_album1_img_iv"
+                app:layout_constraintTop_toTopOf="@id/home_pannel_album1_img_iv" />
+
+            <TextView
+                android:id="@+id/home_pannel_album1_singer_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="15dp"
+                android:text="bear"
+                android:textColor="@color/white"
+                android:textStyle="bold"
+                app:layout_constraintBottom_toBottomOf="@id/home_pannel_album1_img_iv"
+                app:layout_constraintStart_toEndOf="@id/home_pannel_album1_img_iv"
+                app:layout_constraintTop_toBottomOf="@id/home_pannel_album1_title_tv" />
+
+            <ImageView
+                android:id="@+id/home_pannel_album_img_iv"
+                android:layout_width="40dp"
+                android:layout_height="40dp"
+                android:layout_marginStart="20dp"
+                android:src="@drawable/img_album_exp"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintBottom_toBottomOf="@+id/home_pannel_vp"
+                android:layout_marginBottom="20dp"/>
+
+            <TextView
+                android:id="@+id/home_pannel_album_singer_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="16dp"
+                android:text="bear"
+                android:textColor="@color/white"
+                android:textStyle="bold"
+                app:layout_constraintBottom_toBottomOf="@id/home_pannel_album_img_iv"
+                app:layout_constraintStart_toEndOf="@id/home_pannel_album_img_iv"
+                app:layout_constraintTop_toBottomOf="@+id/home_pannel_album_title_tv" />
+
+            <TextView
+                android:id="@+id/home_pannel_album_title_tv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="16dp"
+                android:text="In My Bed"
+                android:textColor="@color/white"
+                android:textStyle="bold"
+                app:layout_constraintBottom_toTopOf="@+id/home_pannel_album_singer_tv"
+                app:layout_constraintStart_toEndOf="@id/home_pannel_album_img_iv"
+                app:layout_constraintTop_toTopOf="@id/home_pannel_album_img_iv" />
+
+            <TextView
+                android:id="@+id/home_today_music_title"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="15dp"
+                android:layout_marginTop="10dp"
+                android:text="오늘 발매 음악"
+                android:textColor="@color/black"
+                android:textSize="16sp"
+                android:textStyle="bold"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/home_pannel_vp"/>
+
+            <ImageView
+                android:id="@+id/home_arrow_more_img_iv"
+                android:layout_width="22dp"
+                android:layout_height="22dp"
+                android:layout_marginStart="116dp"
+                android:layout_marginTop="-22dp"
+                android:src="@drawable/btn_main_arrow_more"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@+id/home_today_music_title"
+                app:tint="@color/black" />
+
+<!--            <ImageView-->
+<!--                android:id="@+id/home_today_music_iv"-->
+<!--                android:layout_width="120dp"-->
+<!--                android:layout_height="120dp"-->
+<!--                android:layout_marginStart="12dp"-->
+<!--                android:layout_marginTop="8dp"-->
+<!--                android:src="@drawable/img_album_exp"-->
+<!--                app:layout_constraintStart_toStartOf="parent"-->
+<!--                app:layout_constraintTop_toBottomOf="@+id/home_today_music_title" />-->
+
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+</ScrollView>
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_locker.xml b/week04/MyApplication/app/src/main/res/layout/fragment_locker.xml
new file mode 100644
index 0000000..cf167ea
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_locker.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:id="@+id/locker_title_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="보관함"
+        android:textSize="23sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginStart="20dp"
+        android:layout_marginTop="15dp"/>
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="로그인"
+        android:textSize="15sp"
+        android:textColor="@color/blue"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginEnd="20dp"
+        android:layout_marginTop="18dp"/>
+
+
+    <com.google.android.material.tabs.TabLayout
+        android:id="@+id/locker_content_tb"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="12dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/locker_title_tv" />
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/locker_song_rv"
+        android:layout_width="match_parent"
+        android:layout_height="500dp"
+        app:layout_constraintTop_toBottomOf="@+id/locker_content_tb"/>
+
+    <androidx.viewpager2.widget.ViewPager2
+        android:id="@+id/locker_content_vp"
+        android:layout_width="410dp"
+        android:layout_height="790dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/locker_content_tb" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_locker_musicfile.xml b/week04/MyApplication/app/src/main/res/layout/fragment_locker_musicfile.xml
new file mode 100644
index 0000000..a644f87
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_locker_musicfile.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="음악파일"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedalbum.xml b/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedalbum.xml
new file mode 100644
index 0000000..b80097e
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedalbum.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="저장앨범"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedsong.xml b/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedsong.xml
new file mode 100644
index 0000000..7585f5f
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_locker_savedsong.xml
@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/locker_select_all_img_iv"
+        android:layout_width="25dp"
+        android:layout_height="25dp"
+        android:src="@drawable/btn_playlist_select_off"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginStart="20dp"
+        android:layout_marginTop="160dp"/>
+
+    <TextView
+        android:id="@+id/locker_select_all_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="전체선택"
+        android:textColor="@color/gray"
+        app:layout_constraintStart_toEndOf="@id/locker_select_all_img_iv"
+        app:layout_constraintTop_toTopOf="@id/locker_select_all_img_iv"
+        app:layout_constraintBottom_toBottomOf="@id/locker_select_all_img_iv"/>
+
+    <ImageView
+        android:id="@+id/locker_play_all_img_iv"
+        android:layout_width="25dp"
+        android:layout_height="25dp"
+        android:src="@drawable/icon_browse_arrow_right"
+        android:layout_marginStart="20dp"
+        app:layout_constraintTop_toTopOf="@id/locker_select_all_img_iv"
+        app:layout_constraintBottom_toBottomOf="@id/locker_select_all_img_iv"
+        app:layout_constraintStart_toEndOf="@id/locker_select_all_tv"/>
+
+    <TextView
+        android:id="@+id/locker_play_all_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="전체듣기"
+        android:textColor="@color/gray"
+        app:layout_constraintTop_toTopOf="@id/locker_select_all_img_iv"
+        app:layout_constraintBottom_toBottomOf="@id/locker_select_all_img_iv"
+        app:layout_constraintStart_toEndOf="@id/locker_play_all_img_iv"/>
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="65dp"
+        android:text="편집"
+        android:textColor="@color/black"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toBottomOf="@id/locker_select_all_img_iv"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="@id/locker_select_all_img_iv" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_locker_tracks.xml b/week04/MyApplication/app/src/main/res/layout/fragment_locker_tracks.xml
new file mode 100644
index 0000000..960ce4d
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_locker_tracks.xml
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ImageView
+        android:id="@+id/locker_track_play_img"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        android:layout_marginTop="10dp"
+        android:src="@drawable/btn_player_play"
+        app:layout_constraintEnd_toStartOf="@+id/locker_track_more_img"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageView
+        android:id="@+id/locker_track_more_img"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        android:layout_marginEnd="10dp"
+        android:layout_marginTop="10dp"
+        android:src="@drawable/btn_player_more"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+
+    <ImageView
+        android:id="@+id/locker_track_img"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:scaleType="fitCenter"
+        android:src="@drawable/img_album_exp2"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginStart="10dp"
+        android:layout_marginTop="5dp"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/item_locker_title_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="LILAC"
+        android:textColor="@color/black"
+        android:textSize="20sp"
+        android:layout_marginTop="5dp"
+        android:maxLines="1"
+        android:ellipsize="end"
+        android:layout_marginStart="5dp"
+        app:layout_constraintStart_toEndOf="@+id/locker_track_img"
+        app:layout_constraintTop_toTopOf="parent"/>
+
+    <TextView
+        android:id="@+id/item_locker_singer_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toEndOf="@+id/locker_track_img"
+        android:layout_marginStart="5dp"
+        android:layout_marginTop="3dp"
+        android:text="아이유 (IU)"
+        android:textColor="@color/lightgray2"
+        android:textSize="15sp"
+        app:layout_constraintTop_toBottomOf="@id/item_locker_title_tv" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_look.xml b/week04/MyApplication/app/src/main/res/layout/fragment_look.xml
new file mode 100644
index 0000000..76aa917
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_look.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="둘러보기 프래그먼트"
+        android:textSize="30sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_pannel.xml b/week04/MyApplication/app/src/main/res/layout/fragment_pannel.xml
new file mode 100644
index 0000000..133aac1
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_pannel.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ImageView
+        android:id="@+id/pannel_image_iv"
+        android:layout_width="match_parent"
+        android:layout_height="450dp"
+        android:scaleType="centerCrop"
+        android:src="@drawable/img_first_album_default"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_search.xml b/week04/MyApplication/app/src/main/res/layout/fragment_search.xml
new file mode 100644
index 0000000..0f3e854
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_search.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="검색 프래그먼트"
+        android:textSize="30sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_song.xml b/week04/MyApplication/app/src/main/res/layout/fragment_song.xml
new file mode 100644
index 0000000..7790d47
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_song.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginLeft="20dp">
+
+    <ImageView
+        android:id="@+id/item_song_play_img"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        android:layout_marginTop="10dp"
+        android:src="@drawable/btn_player_play"
+        app:layout_constraintEnd_toStartOf="@+id/item_song_more_img"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageView
+        android:id="@+id/item_song_more_img"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        android:layout_marginEnd="10dp"
+        android:layout_marginTop="10dp"
+        android:src="@drawable/btn_player_more"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/item_album_title_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="LILAC"
+        android:textColor="@color/black"
+        android:textSize="20sp"
+        android:maxLines="1"
+        android:ellipsize="end"
+        android:layout_marginStart="15dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"/>
+
+    <TextView
+        android:id="@+id/item_album_singer_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginStart="15dp"
+        android:layout_marginTop="3dp"
+        android:text="아이유 (IU)"
+        android:textColor="@color/lightgray2"
+        android:textSize="15sp"
+        app:layout_constraintTop_toBottomOf="@id/item_album_title_tv" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/fragment_video.xml b/week04/MyApplication/app/src/main/res/layout/fragment_video.xml
new file mode 100644
index 0000000..547a66f
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/fragment_video.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="영상 프레그먼트"
+        android:textSize="30sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/item_album.xml b/week04/MyApplication/app/src/main/res/layout/item_album.xml
new file mode 100644
index 0000000..3f379dc
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/item_album.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="150dp"
+    android:layout_height="wrap_content"
+    android:layout_marginLeft="20dp">
+
+    <androidx.cardview.widget.CardView
+        android:id="@+id/item_album_cover_img_cardView"
+        android:layout_width="150dp"
+        android:layout_height="150dp"
+        app:cardCornerRadius="7dp"
+        app:cardElevation="0dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent">
+
+    <ImageView
+            android:id="@+id/item_album_cover_img_iv"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:scaleType="fitCenter"
+            android:src="@drawable/img_album_exp2"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+    </androidx.cardview.widget.CardView>
+
+    <ImageView
+        android:id="@+id/item_album_play_img_iv"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginBottom="5dp"
+        android:src="@drawable/widget_black_play"
+        app:layout_constraintBottom_toBottomOf="@id/item_album_cover_img_cardView"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <TextView
+        android:id="@+id/item_album_title_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="10dp"
+        android:text="LILAC"
+        android:textColor="@color/black"
+        android:textSize="15sp"
+        android:maxLines="1"
+        android:ellipsize="end"
+        app:layout_constraintStart_toStartOf="@id/item_album_cover_img_cardView"
+        app:layout_constraintTop_toBottomOf="@id/item_album_cover_img_cardView" />
+
+    <TextView
+        android:id="@+id/item_album_singer_tv"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="3dp"
+        android:text="아이유 (IU)"
+        android:textColor="@color/lightgray2"
+        android:textSize="12sp"
+        app:layout_constraintStart_toStartOf="@id/item_album_cover_img_cardView"
+        app:layout_constraintTop_toBottomOf="@id/item_album_title_tv" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/main_activity.xml b/week04/MyApplication/app/src/main/res/layout/main_activity.xml
new file mode 100644
index 0000000..fbe8b74
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/main_activity.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/main_container"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@id/home_mini_player_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <LinearLayout
+        android:id="@+id/home_mini_player_content"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="10dp"
+        android:orientation="vertical"
+        android:layout_marginStart="10dp"
+        app:layout_constraintBottom_toTopOf="@id/home_bottom_navigation">
+
+        <TextView
+            android:id="@+id/home_mini_player_title"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Pop Song"
+            android:textSize="17sp" />
+
+        <TextView
+            android:id="@+id/home_mini_player_singer"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Kenshi Yonezu"
+            android:textSize="15sp" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/home_mini_player"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintBottom_toTopOf="@id/home_bottom_navigation"
+        android:layout_marginBottom="10dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="15dp">
+
+
+        <ImageView
+            android:id="@+id/home_mini_player_previous"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/btn_miniplayer_previous"/>
+
+        <ImageView
+            android:id="@+id/home_mini_player_play"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/btn_miniplayer_play"/>
+
+        <ImageView
+            android:id="@+id/home_mini_player_next"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/btn_miniplayer_next"/>
+
+        <ImageView
+            android:id="@+id/home_mini_player_go_list"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/btn_miniplayer_go_list"/>
+
+    </LinearLayout>
+
+    <include
+        layout="@layout/bottom_nav"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/layout/song_activity.xml b/week04/MyApplication/app/src/main/res/layout/song_activity.xml
new file mode 100644
index 0000000..2422840
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/layout/song_activity.xml
@@ -0,0 +1,263 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/song_activity_setting_img_iv"
+        android:layout_width="38dp"
+        android:layout_height="38dp"
+        android:src="@drawable/btn_player_setting"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="15dp"
+        android:layout_marginStart="15dp"/>
+
+    <ImageView
+        android:id="@+id/song_activity_arrow_down"
+        android:layout_width="38dp"
+        android:layout_height="38dp"
+        android:src="@drawable/btn_main_arrow_more"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.95"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="10dp"
+        app:tint="@color/black"
+        android:rotation="90"/>
+
+    <ImageView
+        android:id="@+id/song_activity_more_img_iv"
+        android:layout_width="38dp"
+        android:layout_height="38dp"
+        android:src="@drawable/btn_player_more"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.95"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="45dp"
+        app:tint="@color/black" />
+
+
+    <TextView
+        android:id="@+id/song_activity_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Pop Song"
+        android:textSize="20dp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/song_activity_title_img_iv"
+        android:layout_marginBottom="50dp"/>
+
+    <TextView
+        android:id="@+id/song_activity_singer"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Kenshi Yonezu"
+        android:textSize="18dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/song_activity_title_img_iv"
+        android:layout_marginBottom="20dp"/>
+
+    <ImageView
+        android:id="@+id/song_activity_next_to_singer"
+        android:layout_width="22dp"
+        android:layout_height="22dp"
+        android:layout_marginStart="272dp"
+        android:layout_marginTop="156dp"
+        android:src="@drawable/btn_main_arrow_more"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:tint="@color/black" />
+
+    <ImageView
+        android:id="@+id/song_activity_title_img_iv"
+        android:layout_width="230dp"
+        android:layout_height="230dp"
+        android:src="@drawable/img_album_exp2"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="200dp"
+        />
+
+
+    <TextView
+        android:id="@+id/song_activity_letter_1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="가사 1"
+        android:textSize="15dp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/song_activity_title_img_iv"
+        android:layout_marginTop="20dp"/>
+
+    <TextView
+        android:id="@+id/song_activity_letter_2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="가사 2"
+        android:textSize="15dp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/song_activity_letter_1"
+        android:layout_marginTop="13dp"/>
+
+    <ImageView
+        android:id="@+id/song_activity_like_img_iv"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        android:src="@drawable/ic_my_like_off"
+        app:layout_constraintTop_toBottomOf="@id/song_activity_letter_2"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/song_activity_unlike_img_iv"
+        android:layout_marginTop="8dp"/>
+
+    <ImageView
+        android:id="@+id/song_activity_unlike_img_iv"
+        android:layout_width="33dp"
+        android:layout_height="33dp"
+        android:src="@drawable/btn_player_unlike_off"
+        app:layout_constraintTop_toBottomOf="@id/song_activity_letter_2"
+        app:layout_constraintStart_toEndOf="@id/song_activity_like_img_iv"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginTop="8dp"
+        app:layout_goneMarginStart="24dp"
+        app:layout_constraintHorizontal_chainStyle="packed"/>
+
+    <ImageView
+        android:id="@+id/song_activity_instagram_img_iv"
+        android:layout_width="43dp"
+        android:layout_height="43dp"
+        android:layout_marginBottom="7dp"
+        android:src="@drawable/btn_actionbar_instagram"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginStart="7dp"
+        />
+
+    <ImageView
+        android:id="@+id/song_activity_similar_song_img_iv"
+        android:layout_width="53dp"
+        android:layout_height="53dp"
+        android:layout_marginBottom="5dp"
+        android:src="@drawable/btn_player_related"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        />
+
+    <ImageView
+        android:id="@+id/song_activity_bottom_more_img_iv"
+        android:layout_width="43dp"
+        android:layout_height="43dp"
+        android:layout_marginBottom="7dp"
+        android:src="@drawable/btn_player_more"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="7dp"
+        />
+
+    <SeekBar
+        android:id="@+id/song_progress"
+        android:layout_width="0dp"
+        android:layout_height="4dp"
+        android:max="100"
+        android:progress="5"
+        android:progressBackgroundTint="@color/gray"
+        android:progressTint="@color/deepgray"
+        android:thumb="@android:color/transparent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/song_activity_like_img_iv"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginTop="30dp"/>
+
+    <TextView
+        android:id="@+id/song_start_time"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="00:00"
+        android:textSize="15dp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/song_progress"
+        android:layout_marginStart="10dp"
+        android:textColor="@color/lightgray"
+        android:layout_marginTop="8dp"/>
+
+    <TextView
+        android:id="@+id/song_end_time"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="03:27"
+        android:textSize="15dp"
+        android:textStyle="bold"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/song_progress"
+        android:layout_marginEnd="10dp"
+        android:textColor="@color/lightgray"
+        android:layout_marginTop="8dp"/>
+
+    <ImageView
+        android:id="@+id/song_activity_repeat_img_iv"
+        android:layout_width="45dp"
+        android:layout_height="45dp"
+        android:src="@drawable/nugu_btn_repeat_inactive"
+        app:layout_constraintTop_toBottomOf="@id/song_progress"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginTop="30dp"
+        android:layout_marginStart="40dp"
+        />
+
+    <ImageView
+        android:id="@+id/song_activity_random_img_iv"
+        android:layout_width="45dp"
+        android:layout_height="45dp"
+        android:src="@drawable/nugu_btn_random_inactive"
+        app:layout_constraintTop_toBottomOf="@id/song_progress"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginTop="30dp"
+        android:layout_marginEnd="40dp"
+        />
+
+    <ImageView
+        android:id="@+id/song_activity_previous_player_img_iv"
+        android:layout_width="60dp"
+        android:layout_height="60dp"
+        app:layout_constraintTop_toBottomOf="@id/song_progress"
+        android:layout_marginTop="20dp"
+        app:layout_constraintEnd_toStartOf="@id/song_activity_play_player_img_iv"
+        android:src="@drawable/btn_miniplayer_previous"/>
+
+    <ImageView
+        android:id="@+id/song_activity_play_player_img_iv"
+        android:layout_width="60dp"
+        android:layout_height="60dp"
+        app:layout_constraintTop_toBottomOf="@id/song_progress"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginTop="20dp"
+        android:src="@drawable/btn_miniplayer_play"/>
+    <ImageView
+        android:id="@+id/song_activity_next_player_img_iv"
+        android:layout_width="60dp"
+        android:layout_height="60dp"
+        app:layout_constraintTop_toBottomOf="@id/song_progress"
+        app:layout_constraintStart_toEndOf="@id/song_activity_play_player_img_iv"
+        android:layout_marginTop="20dp"
+        android:src="@drawable/btn_miniplayer_next"/>
+
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/menu/bottom_nav_menu.xml b/week04/MyApplication/app/src/main/res/menu/bottom_nav_menu.xml
new file mode 100644
index 0000000..5e2d0a1
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/menu/bottom_nav_menu.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/menu_home"
+        android:icon="@drawable/ic_bottom_home_no_select"
+        android:title="홈" />
+
+    <item
+        android:id="@+id/menu_look"
+        android:icon="@drawable/ic_bottom_look_no_select"
+        android:title="둘러보기" />
+
+    <item
+        android:id="@+id/menu_search"
+        android:icon="@drawable/ic_bottom_search_no_select"
+        android:title="검색" />
+
+    <item
+        android:id="@+id/menu_locker"
+        android:icon="@drawable/ic_bottom_locker_no_select"
+        android:title="보관함" />
+</menu>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home.xml b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home.xml
new file mode 100644
index 0000000..ddd82e3
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home.xml
@@ -0,0 +1,4 @@
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@android:color/white"/>   <!-- 단색 배경 -->
+    <foreground android:drawable="@mipmap/home"/>          <!-- home.webp -->
+</adaptive-icon>
diff --git a/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home_round.xml b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home_round.xml
new file mode 100644
index 0000000..ddd82e3
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/home_round.xml
@@ -0,0 +1,4 @@
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@android:color/white"/>   <!-- 단색 배경 -->
+    <foreground android:drawable="@mipmap/home"/>          <!-- home.webp -->
+</adaptive-icon>
diff --git a/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..53c6b82
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/white" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..bc456f5
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/white"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/mipmap-hdpi/home.webp b/week04/MyApplication/app/src/main/res/mipmap-hdpi/home.webp
new file mode 100644
index 0000000..734235c
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diff --git a/week04/MyApplication/app/src/main/res/mipmap-hdpi/home_round.webp b/week04/MyApplication/app/src/main/res/mipmap-hdpi/home_round.webp
new file mode 100644
index 0000000..5e11903
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-hdpi/home_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher.webp b/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher.webp
new file mode 100644
index 0000000..c209e78
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp b/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..b2dfe3d
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-mdpi/home.webp b/week04/MyApplication/app/src/main/res/mipmap-mdpi/home.webp
new file mode 100644
index 0000000..cd072e3
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-mdpi/home.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-mdpi/home_round.webp b/week04/MyApplication/app/src/main/res/mipmap-mdpi/home_round.webp
new file mode 100644
index 0000000..fdb835a
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-mdpi/home_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher.webp b/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher.webp
new file mode 100644
index 0000000..4f0f1d6
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp b/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..62b611d
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home.webp b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home.webp
new file mode 100644
index 0000000..680dc67
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home_round.webp
new file mode 100644
index 0000000..2d1537d
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/home_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher.webp b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
new file mode 100644
index 0000000..948a307
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..1b9a695
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home.webp b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home.webp
new file mode 100644
index 0000000..fc66c42
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home_round.webp
new file mode 100644
index 0000000..b6615f9
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/home_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..28d4b77
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..9287f50
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home.webp b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home.webp
new file mode 100644
index 0000000..32a13ef
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home_round.webp
new file mode 100644
index 0000000..de82679
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/home_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..aa7d642
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp differ
diff --git a/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..9126ae3
Binary files /dev/null and b/week04/MyApplication/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp differ
diff --git a/week04/MyApplication/app/src/main/res/values-night/themes.xml b/week04/MyApplication/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..d25b0f2
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,7 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.MyApplication" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your dark theme here. -->
+        <!-- <item name="colorPrimary">@color/my_dark_primary</item> -->
+    </style>
+</resources>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/values/colors.xml b/week04/MyApplication/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..6ef823e
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+    <color name="lightgray">#DCDCDC</color>
+    <color name="blue">#0000CD</color>
+    <color name="gray">#808080</color>
+    <color name="deepgray">#696969</color>
+    <color name="lightgray2">#a8a8a8</color>
+</resources>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/values/dimens.xml b/week04/MyApplication/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..2372670
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/values/dimens.xml
@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="space_for_bottom_bars">140dp</dimen>
+</resources>
diff --git a/week04/MyApplication/app/src/main/res/values/strings.xml b/week04/MyApplication/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..3de1a39
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">My Application</string>
+</resources>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/values/themes.xml b/week04/MyApplication/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..d66ac09
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/values/themes.xml
@@ -0,0 +1,9 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.MyApplication" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your light theme here. -->
+        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
+    </style>
+
+    <style name="Theme.MyApplication" parent="Base.Theme.MyApplication" />
+</resources>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/xml/backup_rules.xml b/week04/MyApplication/app/src/main/res/xml/backup_rules.xml
new file mode 100644
index 0000000..4df9255
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/xml/backup_rules.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older than API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/main/res/xml/data_extraction_rules.xml b/week04/MyApplication/app/src/main/res/xml/data_extraction_rules.xml
new file mode 100644
index 0000000..9ee9997
--- /dev/null
+++ b/week04/MyApplication/app/src/main/res/xml/data_extraction_rules.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>
\ No newline at end of file
diff --git a/week04/MyApplication/app/src/test/java/com/example/myapplication/ExampleUnitTest.kt b/week04/MyApplication/app/src/test/java/com/example/myapplication/ExampleUnitTest.kt
new file mode 100644
index 0000000..e500fb8
--- /dev/null
+++ b/week04/MyApplication/app/src/test/java/com/example/myapplication/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package com.example.myapplication
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/build.gradle.kts b/week04/MyApplication/build.gradle.kts
new file mode 100644
index 0000000..8b15ec6
--- /dev/null
+++ b/week04/MyApplication/build.gradle.kts
@@ -0,0 +1,14 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.android) apply false
+}
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.0")
+    }
+}
\ No newline at end of file
diff --git a/week04/MyApplication/gradle.properties b/week04/MyApplication/gradle.properties
new file mode 100644
index 0000000..20e2a01
--- /dev/null
+++ b/week04/MyApplication/gradle.properties
@@ -0,0 +1,23 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true
\ No newline at end of file
diff --git a/week04/MyApplication/gradle/libs.versions.toml b/week04/MyApplication/gradle/libs.versions.toml
new file mode 100644
index 0000000..c44280b
--- /dev/null
+++ b/week04/MyApplication/gradle/libs.versions.toml
@@ -0,0 +1,26 @@
+[versions]
+agp = "8.13.0"
+kotlin = "2.0.21"
+coreKtx = "1.17.0"
+junit = "4.13.2"
+junitVersion = "1.3.0"
+espressoCore = "3.7.0"
+appcompat = "1.7.1"
+material = "1.13.0"
+activity = "1.11.0"
+constraintlayout = "2.2.1"
+
+[libraries]
+androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
+androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
+material = { group = "com.google.android.material", name = "material", version.ref = "material" }
+androidx-activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
+androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+
diff --git a/week04/MyApplication/gradle/wrapper/gradle-wrapper.jar b/week04/MyApplication/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
Binary files /dev/null and b/week04/MyApplication/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/week04/MyApplication/gradle/wrapper/gradle-wrapper.properties b/week04/MyApplication/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e208ace
--- /dev/null
+++ b/week04/MyApplication/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Mon Sep 22 05:49:25 KST 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/week04/MyApplication/gradlew b/week04/MyApplication/gradlew
new file mode 100644
index 0000000..4f906e0
--- /dev/null
+++ b/week04/MyApplication/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/week04/MyApplication/gradlew.bat b/week04/MyApplication/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/week04/MyApplication/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/week04/MyApplication/settings.gradle.kts b/week04/MyApplication/settings.gradle.kts
new file mode 100644
index 0000000..7e67774
--- /dev/null
+++ b/week04/MyApplication/settings.gradle.kts
@@ -0,0 +1,24 @@
+pluginManagement {
+    repositories {
+        google {
+            content {
+                includeGroupByRegex("com\\.android.*")
+                includeGroupByRegex("com\\.google.*")
+                includeGroupByRegex("androidx.*")
+            }
+        }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "My Application"
+include(":app")
+ 
\ No newline at end of file