I just updated to the latest version after a couple weeks, now I get this.
EDIT: After some testing, I found this also appears if I try to go to any of the other recent versions.
What were you doing when it crashed?
looks like its trying to load a savegame and not finding what it needs there, might be corrupted.
The launcher does that occasionally.
If you must use the launcher, keep backups of your savegames.
I think I fixed it, I just started deleting stuff.
I deleted the save folder but it still crashed.
Then I decided to check the Json, and found a lastworld file and it seems to work now that that’s gone. Lets hope it doesn’t break more later.