Admob problems

Hello,

Along the process of making this game, there have been many struggles. i have finally got it to work, compiled it for android with an apk, but now i cant get admob to work. I have updated stencyl to the newest and gottern the newest admob extension. the game will compile and publish with admob disabled and no ad blocks in the game, but with it will say build failed. I dont know what the problem is.

Sugesstions please?