Problem with multiple screen app

I made an app with 2 screens it works good when i connect my phone with Ai companion. but when i made its apk file and install it to my phone it doesnot shift from 1 screen to another. It shows a run time error. need an urgent solution

thanks in advance for your help.

Please post some screenshots of your blocks so we can see what you're doing and where the problem might be.

The recommended method of switching screens in App Inventor