Please send us a screenshot of your error messages and we may be able to assist you.
Ah, that's because you're playing the game out of a OneDrive location, or you have some kind of cloudsync settings that are trying to make the game save / load to a OneDrive folder.
Due to the nature of OneDrive, it can cause the "persistent.rpgsave" to get desynchronised from the rest of the game. This file is constantly being checked / updated / referred to during the playing of the game and if it doesn't properly match the game's current state it will cause this error.
Anyway, the simple fix is to check where you have our game saved. If it's in your OneDrive folder, please move it out of there. If you have a setting where your files and folders are automatically synced to OneDrive, you'll want to disable that specifically for Grove.