@meclairer, do you happen to play with Mods or Custom Content (CC)?🤔 Mods and CC have to be updated by their creators in order to work with the changes any pack (like ROM) or any update/patch that EA releases for the game.🤨 If you use Mods/CC please do the following:
1) Move the mods folder to your Desktop
2) Delete the localthumbcache.package file in the Game Folder
3) Fix your game in Origin by logging into Origin and go to your Library and Right-click on The Sims 4 and choose the option to "Repair Game". Wait for Origin to fix all your pack and not just the base game.
4), Now, when you turn on your game again it will create a new, empty mods folder. Check to see if your game is now working without your mods/CC.
5) If you game is now working then you need to find the outdated Mod or item of CC. It is possible that more than one will be outdated. To find the culprit(s), you will need to add all your Mods and CC back one at a time while checking your game to see when the problem shows up again. (If you have a lot of CC/Mods you might have to do the 50/50 Method). When you find the broken Mods/CC you need to check back with the creator to see if and when they have a new version available that will work with the changes that EA made to the game with the patch and the new pack.
You will probably have to do this any time EA releases an update. It is the responsibility of the Mods/CC makers to update their items, and it is the responsibility of the people who use those items to keep up with the newest versions.
Please update us on how if this is your problem or not! 😇
Best of luck!🙂
