Reading Error on Save File Loading

Launched the game after a 2 months’ absence, and am currently getting this error. I don’t trust myself well enough to fiddle about with game files without guidance or a full understanding of what to do, so I’d appreciate some help.

Usually this indicates that the save file is invalid. Unfortunately hard to diagnose actual issue, especially if mods are in use.

Do any of the other saves work?

Maybe you have mods activated with ultimate lib on?

This is the only save I had when I took the screenshot.

I don’t know what Ultimate Lib is, but I’m sure that I don’t have it, much less have it enabled.