are you on android by chance? idk a fix but the guy below you said he's on 3.0 and he's on android.
Viewing post in Maeve's Academy v0.5.2 - Public Release! comments
sounds like a common issue then. hopefully there's a fix, but i wouldn't know. did you have a save in 3.0 or 4.2 at some point? did you just override the previous copy of the game or did you install it freshly? it might be trying to revert back to 3.0 because it detected old save data for that (or possibly just a save from 4.2), but i'm not a tech guy. my recommendation: try deleting cache and data. if that doesn't work, uninstall and reinstall. and if that doesn't work, try the discord.