Why doesn't the .exe run?

Question

Python

I made an exe file from a python script. It works itself: displays an input window. But when I make an exe file, if I open it, an error appears:

Worked through pyinstaller.
pyinstaller -F -w -i"C:\Users\User\Desktop\Project\app.ico" Main.py
Explain what's wrong?
I know that it’s worth doing this in languages ​​such as C ++ or C #, but I don’t know them yet (
And if there is such an opportunity, then why not?)