Hi, I also started having this issue yesterday. I did some troubleshooting.
- It's just one family in my save that won't load.
- I removed all mods and cc & then repaired the game.
- I can access the house through build mode / if I evict and move another family in, it's fine.
- The family has a Dad, Mum (who I've played since baby), 3 infants, a dog and a cat.
If I move the mum and infants out, I can load the file with the Dad and pets.
But the mum won't load on her own, and I tried one of the infants with the Dad and that didn't load.
I did what you said above, and here is the lastexception file that got created after re-trying after deleting the other files.