Better error reporting when missing slot names (closes #240)

Author: michbarsinai

src/main/java/edu/harvard/iq/policymodels/cli/commands/LocalizationDiffCommand.java

@@ -38,7 +38,7 @@ public String command() {
 
     @Override
     public String description() {
-        return "Prints the differences between a localization and the model (e.g. non-licalized nodes).";
+        return "Prints the differences between a localization and the model (e.g. non-localized nodes).";
     }
 
     @Override

src/main/java/edu/harvard/iq/policymodels/parser/decisiongraph/CompilationUnit.java

@@ -196,7 +196,7 @@ private AbstractSlot findSlot(List<String> astSlot, CompoundValue topValue, SetN
                 final CompoundValue additionPoint = valueBuilder.descend(C.tail(fullyQualifiedSlotName.get(astSlot)), topValue);
                 slot = additionPoint.getSlot().getSubSlot(C.last(astSlot));
             } catch (RuntimeException re) {
-                throw new RuntimeException("Tag not found");
+                throw new RuntimeException("Slot " + astSlot.toString() + " not found");
             }
         }
         return slot;

src/main/java/edu/harvard/iq/policymodels/parser/decisiongraph/SetNodeValueBuilder.java

@@ -85,7 +85,8 @@ public void visit(AstSetNode.AggregateAssignment aa) {
         valueType.accept(new AbstractSlot.VoidVisitor() {
             @Override
             public void visitAtomicSlotImpl(AtomicSlot t) {
-                throw new RuntimeException("Slot " + aa.getSlot() + " is atomic, not aggregate. Can't assign values here.");
+                throw new RuntimeException("Slot " + aa.getSlot() + " is atomic, not aggregate. Can't add values "
+                    + "("+ aa.getSlot().get(0) + "+=value), only assign them ("+ aa.getSlot().get(0) +"=value)");
             }
 
             @Override