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

I tried, clean & rebuild project and Invalidate Cache & Restart also manually removed .gradle and .idea folders, but that didn't solved the issue.

I have 3 user acounts in my phone. So, I didn't select Uninstall for all users, and it only uninstall my app from first user account, but it was still there in guest and second user account.

So, I removed it from rest of the accounts and it solved my issue!!