my app is closing automatically

I have made an app of my own through android builder but there is a problem in it, in my app the first screen is working fine but as soon as I go to the second screen of my app the app closes automatically (This problem is coming in more than one app of my app) Tell me the solution of this problem

I am sending the screen shortcode of my block

Have you dragged Admob core on the home screen?

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