"Default Activity Not Found" on Android Studio upgrade

Issue

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

I reverted back to 12.0.4 and it everything works again.

Any ideas? I think it might be an issue with a missing plugin. Since the plugin is not installed, it is not able to find the default activity. Another thing could have been a local configuration, but I doubt it. I deleted the configuration folder to verify and that didn't change anything.

Solution

If you see that error occur after upgrading versions of IntelliJ IDEA or Android Studio, or after generating a new APK file, you may need to refresh the IDE's cache.

Menu File → Invalidate Caches and restart...

Answered By - Sky Kelsey