It seems like we're having the same exact issue!! I've been trying to sort it out for more hours than I'd care to admit. I've tried everything.
Whenever I try to edit a lot from the world map, I get the error code 122:ae1a18cc:5136b7a3 (I can only get to build mode from an active household). I also keep getting this last exception when I start the game:
The problem doesn't seem to be anything in the mods folder because they're up to date; even though Nisa's mod and Basemental's mod were listed as causing the last exception, I still got the same error code after taking everything out and doing the 50/50 method.
The tray files aren't the problem either. There's a conflict within the saves themselves that has been caused by mods, but removing mods and deleting households won't do anything-- only creating a new save will. I got no error codes or last exceptions with a new save. However, as soon as I loaded my old save, I got the error code and last exception.
I wish I knew what the problem was because I don't trust playing the game with these errors. I'm just so glad I backed up all my saves, tray items, and mods before I updated.
I tried opening several saves and still had the same issue; I was only able to edit a lot and play a household without that initial LE on an entirely new save. So, I wouldn't be losing progress-- I'd have to start over completely.
And, yah, I use MCCC. When I kept Nisa's mod in, I got an LE that included her mod and Basemental's. It did also mention a dindu_nuffin_trait from Nisa, but I haven't been able to find anything about it anywhere.
When I loaded the game without Nisa's mod, I still received the same LE, but it didn't specifically mention Nisa or Basemental (I included that LE in my first reply). It doesn't say what trait is causing the issue (it just says remove_known_trait), which is SO frustrating.
Again, those LEs come up as soon as the game loads. I don't know if that is related to my inability to edit lots from the world map or if it's a separate issue completely.
