ERROR: Android Source Generator: [project] AndroidManifest.xml file not found
you must open Project Structure modified something.
example: Project Structure > Facets ,you can see this is:
delete ".idea", like this
ok, IDE there find AndroidManifest.xml
I know the problem in IDEA because you create a new project with Java configuration (not android, but with android sdk dependency)
File > New Project > Java (Java Module) > Project SDK Android 4.X
Here is the solution :
File > New Project > Android (Application Module)