Session 'app': Error Launching activity in Android Studio 3.1.3

Question

How can I fix this error. MainActivity class already in my project. Here's a screenshot of the error

I tried this link, but it didn't work for me

Answer 1

I got this error as well. For me it helped to set minifyEnabled to false for my debug version. After Clean Build it launched again.

Answer 2

It may be silly but make sure you have enough storage on your phone. This was the problem for me