If you are seeing errors such as “unknown command” make sure that python and pip are in your system environment variables.
- Go to system properties and click on the “Environment Variables” button
- Go to the “Path Environment Variable” and click “Edit”
- From here you want to make sure that both “pip3.exe” and “python.exe” are included in here as such
Depending on the error one fix that I discovered was to go into the Gradle scripts to the build.gradle (Module: app) file and changing the implementation to “implementation ‘org.tensorflow:tensorflow-android:1.5.0”: 
I’d suggest StackOverflow or google because that helped me the most……. Best of Luck!