“Default Activity Not Found” on Android Studio upgrade

Question

I upgraded IntelliJ Idea from 12.0.4 to 12.10.

Now all the modules in my Android project give the error:

Error: Default Activity Not Found

Answer 1

I have the same problem in Android Studio 3.3 Canary 3. Project from Android Studio 3.0 stabile version works firstly correctly, than after some cleans/rebuilds it starts showing No Default Activity error. I tried to reinstall this alpha version of Android Studio: error again. But then started it in old stabile Android, and using apk install, and this apk works correctly.

Moreover my project was created with Instant App (base, feature, instant, app subdirectories). I think this Android Studio has some problems with Manifest.xml files separated into this multiple directories.

So I have changed in settings to this: