IntelliJ IDEA - Can't build anything, always get “package R does not exist”

Question

I\'m trying to use IntelliJ IDEA to work on an Android app with a colleague that swears by it, but I\'m unable to build any of the Android projects he sends me because whene

Answer 1

In my case I had to delete the intellj compiler cache. on my windows machine it was somelike this:

%USERPROFILE%\.IdeaIC12\system\compile-server\