I upgraded IntelliJ Idea 12.0.4 to 12.10.
Now all the modules in my Android project give the error:
Error: Default Activity Not Found
I reverted to 12.0.4 and it works.
Any ideas ?? I think it might be related to some plugins not being installed cause the only other thing could have been a local config but I deleted the configuration folder to confirm and that didn't change anything.
If you see that error occur after upgrading your IDEA, upgrading Android Studio version, or Generating a new APK, you may need to refresh the IDE's cache.
File -> Invalidate Caches / Restart...