Getting `Error:Cannot get property ':lib' on null object` on a new Android Studio project

Question

I've created a new project with Android Studio and added new lib project inside, but now I'm getting this:

Error:Cannot get property ':lib' on null object.

Answer 1

Apparently I managed to solve it by adding comma in settings.gradle file.

Before I had:

include ':app' ':lib'

Changed to:

include ':app', ':lib'

Note, the comma!

Error messages could be better :)