Session 'app': Error Launching activity

Question

After the Android Studio 2.0 update while the gradle build finishes I get this :

Session \'app\': Error Launching activity .

It prevents the app from starting

Answer 1

All answers did not work for me.This error raised when I was trying to rename the app package.I have ended up creating a new project with the new package name and move my files to the new one.