ah, I see. you're trying to play it on Android. well, this error is about the quick menu, but I'm not sure why RenPy complains here, lol. I can give you a version with a fix for this error, I just don't know if this will affect any transitions, it normally shouldn't but you never know xD you will have to try for me ^^
here's the Link - I hope it works for you now <3