How can you figure out what it is that's causing it!? when you have over 3000 CC mods? this problem didn't start until I downloaded CC today and I THOUGHT I deleted it but it still gives the same message I'm starting to get pissed because I can't lose my CC ☹️😮
It's cc most of the time so mods ARE probably safe (but given we had a patch, you need to check on those anyways).
Remove the cc you've added last first, in groups, until it starts again.
Could be that a cc got borked with the update too and it's something you had for a while.
These are the fastest methods: http://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content
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