I just started getting this error crash today after over 1300 hours of play time. I started playing just after Mistlands was launched.

I've done nearly everything this and other threads have talked about as there are several. I'm about to give up and delete the whole not-launching game. I've never had to play around with the game files so I don't even know if I've backed up the correct files for my world/player data. Is there a guide to this ? Haven't found one yet.

No mods either, so I even tried loading BepInEx and added some plain mods, like "better ladder" and such to see if that fixed it as others have said it helped them.
From what I've read, it is not mods, as several non-mod users are crashing with the same error and when I added the most recent BepInEx as outlined above the game loading seemed to work smoother yet still crashed at the same point. It did it regardless for me with or without mods.

I'm going to just dump everything and reload vanilla and what I think is my game data and if I lose 1300+ hours worth of play, well that is just too bad - will probably never play it again.