Does it help if you disable save file naming in the game settings (the top toggle there)?
If it doesn't, I would appreciate it if you copied the error message and described how you are playing the game (desktop or mobile, for example).
I had the same issue and I changed the settings like you said here, and it seems to have solved the issue!
Thank you for taking the time to let me know! Naming the saves is a convenience feature, so it seems like it will be better if I make it opt-in rather than opt-out.
