I cannot find the root of the issue with the log and the description. Despite having a look. But my wild guess is that your game files might be slightly corrupted, because I see a bunch of error that shouldn't happen and are relying on pure and simple data :^/

So maybe try to validate/reinstall the game.

Steam updates can, rarely, corrupt the local files I'm afraid

Hello = )

I'm afraid those save files are missing their counter part, ".meta" ^^' Could you by any chance upload the meta files associated with those save ?

Thank you ^^