I couldn't find too many answers for why I was getting meaningless error codes when I was trying to save a game AND why my game would crash trying to load a save.
I figured out eventually that my SSD had basically no disk space, and I suppose the game is saving incompletely since there was no space to put the saveinfo....
Anyway, I STRONGLY suggest coding something or what not that stops you from saving the game at all if you have no disc space rather than letting the game "save" some fake/non-functioning save file.
I only had to backtrack a tiny bit, but for some people it could be more. And maybe it'll save others who have this issue time.
I forget which error codes, but it was 501-504. I dunno if they mean you have no disk space to save .... but some message or prompt needs indicate that in english.
Otherwise, fun game. Thanks.