Not able to debug app on android device - Android Studio 2.0

Question

I am not able to debug an app on my device (Asus Zenphone 2) after I updated android studio to 2.0. I keep seeing below message in debug tab right after I click on debug ico

Answer 1

I had this problem in the Android emulator, and it was solved by going to Tools->AVD Manager, selecting the device, right click "Cold Boot Now".