How do I resolve a “'generateDebugSources' not found in project” error?

Question

I was trying to add a dependency to my application and I accidentally modified the wrong build.gradle file and now my application no longer builds correctly.

This is my

Answer 1

In Android Studio menu: Go to File -> Invalidate caches / restart

IMPORTANT NOTE: Take into account that it will also clear "Local History" if it's important to you.