I had the same problem and after 2 days of figuring out how to solve it, I finally got the formula 😃 ! I tried various of steps that I found on the internet such as removing my Mods (but you're free to remove some of your outdated mods just to be sure) or moving my household then moving them back, nothing worked out for me. If they didn't work out for you too, try mine. NOTE: This process does not include removing your cc & mods.
1.) Open your Sims 4
2.) Share all important Households/ Lots/ Rooms from your library to the Gallery (NOTE: You MUST be online to make this possible)
3.) Save & Exit your game.
4.) Remove all Tray Files from Documents\Electronic Arts\The Sims 4\Tray
5.) Open your Sims 4 again and Voila! (It worked for me)
P.S. You can now save your Households/ Lots/ Rooms from the Gallery (Profile: Shared Items) to your library. And that's it!! 🙂 Hope this one helps!
-I don't work for EA-
Community Manager
