Issue with Google Admob

Hey Developers!
I am done with my first app. Before i am going to publish it, i want to inclue ad banners. I decided to use the banners from Admob because the ad banner has to be on the top of the screen.
Now i imported the google ads sdk and coded everything as it should be.
I built the apk and there were no errors. I uploaded it on the google play console and downloaded it on my mobile device. Now the problem is, my app doesn’t want to start. It tries to open up, but instantly jumps out of the game, i can’t even see my menu screen inside of my app.
Is there someone who had the same issue and figured it out how to fix that problem?
Greetings
BeatenByBacon

Make sure you’ve added ids in the android manifest as manual states, otherwise it will crash.

Also, this is a wrong subforum section, try Android instead.