Application Installation Failed in Android Studio

Question

Yesterday my app was running perfect from Android Studio but today when I started working on my app and running it i am getting error message continuously

Answer 1

In my case Instant Run hided the real cause of the problem which was INSUFFICIENT_SPACE due to small data partition and I also got "failed to establish session" error. After disabling Instant Run, the real problem was revealed and after fixing it and enabling Instant Run it worked.