When you got the error for the first time, did your game also crash, causing the error? Either way, if you join the Discord, I can be of much better assistance.
No, the game was working fine. I saved and turned off for the night. The next day when I went to play it wouldn't let me load. It was around the chapter you unlock the 5th CG in.
I just made an account, I didn't post anything there yet but my username is the same.