“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 found this in my code:

If you look very carefully, it should be instead.

Apparently, I refactored an "activity" somewhere, and it changed names in the AndroidManifest as well.