Android Studio: ClassNotFoundException

Question

i was busy with my app for over a week, when suddenly:

11-12 07:59:17.860    1653-1653/nl.test.myapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.Runtim         


        

Answer 1

https://stackoverflow.com/a/29821331/11480535 worked for me with the little addition that I also had to delete the projectFilesBackup/!