NullPointerException: Attempt to invoke virtual method 'void android.support .v7.widget.x.a()' on a null object reference · Issue #6 · Umweltzone/Umweltzone · GitHub
build fails with gradle error ... can't find referenced class ... ActivityCompat21 · Issue #7548 · cgeo/cgeo · GitHub
Error inflating class android.support.v7.widget.ActionBarOverlayLayout" when using the r8.jar version in the d16-0 branch rather than ProGuard · Issue #2931 · xamarin/xamarin-android · GitHub