When adding a new widget to kivy, the application stops working. How to fix?

Question

Python

Recently I started to deal with `kivy` and ran into such a problem.
The application works when run on a PC, but after building via `buildozer` it does not start. Displayed logs through `logcat`, there is no specific error. During the trial, I noticed that a similar error occurs if you add any additional `Layout` (be it `box`, `grid` or `scroll view`). I tried to duplicate already working elements, but the situation does not change. Maybe `kivy` has some kind of limit on the number of widgets?

I ask for help, because I couldn't google anything myself. The contents of the arrays, I think, are not very important, so I'll cut them out.