Encounteres errors while building your game

Hi, :) I  need stencyl for my class, but i've got a problem when i click :      publish/mobile/android
The error occurred when i tried to add admob to the game.
In the past i was abble to create the apk and play the game in my phone (wihtout ads).

I don't understand the logs at all, but i attach them here.
Any help will be highly appreciated.