hey, maybe you can try this:
find path "game/archive.rpa" and extract it with unrpa. Then go to "game/screens/other_screens.rpy" and open in a text editor, press "ctrl + F" to search "if not hasattr(persistent, "cg_unlocked"):" this line, change it to "if persistent.cg_unlocked is None:"
That fixed the startup error for me :) hope this can help(???