@Lyysithea check that your game and console are both up to date, there's info included in the attached troubleshooting steps for you here:
I'd also uninstall and reinstall your game and then do a data sync to sync up with the cloud again. So, clear your locally saved data and sync up with the cloud again by selecting Sims 4 on your console home screen using the menu button (3 lines) go to Manage Game and Add-ons>Saved Data. You'll see 2 sets of data, pick the set next to your gamertag/username and select delete from console only (this step should be carried out while the game is not running). Then immediately load up your game and it will sync up with the cloud and retrieve your data. This can help get your game working again.
