Unable to test app after upgrading to Lollipop

Question

I am using Android Studio to develop my apps.

Since I upgraded my HTC One M8 to Lollipop, I can not use it to test my apps by \"Run app\" in Android Studio. I get

Answer 1

I met the same problem on ASUS ME176C(Lollipop 5.0),
but I resolved it by setting "Select debug app" to "No". Then push apk as usual. After that, you can reselect "debug app" to target app.