Screen1_backPressed crash

Hi, it’s been two days since after recompiling an application, the back button crashes it.
The same application, installed a few days ago, works correctly.
I also tried with other applications (after having recompiled them with another name) that I had already installed and it happens for all the same thing.
Any application, even the simplest one, when the back button is pressed, exits.
It happens both on the smartphone and on the tablet.
Can anyone tell me why?

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