Empty activity project - Error while Launching activity

Question

I'm creating a new project with android studio (with empty activity). I'm not doing any change to the code (use all the defaults), and when I try to run it I get "Error while Launching activity", but the app starts on my device. when trying to start debug, the app is stuck on "waiting for debugger" this is the log I get in the "Run" tab:

$ adb shell am start -n "com.test.testapp/com.test.testapp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Error while executing: am start -n "com.test.testapp/com.test.testapp.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.test.testapp/.MainActivity }

Error while Launching activity

I've tried everything solution suggested to this issue (disable Instant Run, add -r to install flags, delete .idea, clean, invalidate cache) and everything suggested here but nothing works. I'm trying this on a brand new Macbook Pro, with android studio 2.3.3. I had the same issue with my old laptop, so don't think it is a hardware issue. any help would be much appriciated.

So, you are saying app works on device but not on emulator?? — Sahdeep Singh, Aug 29 '17 at 14:38
how are you trying to run the app? with the run button, or with some adb command? are you using an emulator or a connected device? — Rachael, Aug 29 '17 at 14:52
this happens on both the emulator and a real device. trying to run it from the android studio run button — roeiki11, Aug 29 '17 at 15:07
what happens if you enter the following directly into the terminal in Android Studio? `adb shell am start -n "com.test.testapp/com.test.testapp.MainActivity"` — Rachael, Aug 29 '17 at 15:44

Empty activity project - Error while Launching activity

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