@crinrict thank you so much!!
I indeed found something about that issue and tried this:
Exit Sims 4 then drag your whole Sims 4 folder from Document > Electronic Arts to your desktop.
Go to the EA App/Origin, clear its cache (in the EA App that's Help > App Recovery), then do a Game Repair
Launch Sims 4 and reset your Options.
Select "New" and see if you can load the new world.
If that works, exit and copy your old Saves files (not folder) into the new folder and try loading one of those.
but unfortunately it did nog work ☹️