If you're on the phone, try to reboot your device, if it won't help, then redownload and reinstall the game.
If you're not on the phone, I need more context to say what it can be.
I can't say whether it's a Windows 11 related problem or not since I can't test it there, but from what I know, launching Renpy at it shouldn't be much different from Windows 10. And the game works fine there.
If you have similar problems with other games, I'd advise you to look for the solution online with the keywords of your error.