My game crash when I try to exit the CAS or try to save a family

@MissEunhye  Do you use OneDrive?  If so, that may be the issue, or rather OneDrive's attempts to sync the Documents folder may be the issue.  Try pausing syncing and cancelling the current sync:

https://support.microsoft.com/en-au/office/how-to-cancel-or-stop-sync-in-onedrive-4885c27e-3d89-4d69-be75-2646c71367d3

If that helps, make a copy of the Sims 4 folder in Documents\Electronic Arts and store it somewhere that OneDrive doesn't touch.  (An external drive is ideal, but you can put the copy in Downloads in a pinch.)  Then stop OneDrive from automatically syncing Documents:

https://support.microsoft.com/en-us/office/choose-which-onedrive-folders-to-sync-to-your-computer-98b8b011-8b94-419b-aa95-a14ff2415e85

Or, if you have no use for it, unlink OneDrive, which will keep it out of the picture entirely.

https://support.microsoft.com/en-us/office/turn-off-disable-or-uninstall-onedrive-f32a17ce-3336-40fe-9c38-6efb09f944b0

Hi @puzzlezaddict !

I’ve tried to uninstall Onedrive (I have no use of it) but my game keeps crashing.

I’ve tried to enter in Create a sim with another family, another save and the game doesn’t crash. But I’ve remembered that this problem has begun when two kittens have joined my family so I’ve deleted the kittens and my game has stopped crashing. I’ve tried to add a new kitten and the game automatically crashes. So it’s a problem with kittens it seems 😅. 
Thanks for your help!

@MissEunhye  If you want to troubleshoot the issues with pets further, please run a dxdiag and attach it to a post.

https://help.ea.com/en/help/pc/how-to-gather-dxdiag-information/

Please also try playing in a clean user folder.  Move your entire Sims 4 folder out of Documents\Electronic Arts and onto your desktop, and when you launch the game, a clean folder will spawn with no content.  (Your saves and other content will be in the folder you've moved but temporarily not read by the game.)  Don't add anything to this new folder yet; just see whether you can create a household, with kittens, and whether you can save your progress.