Black CAS screen fix?

erixaa

I recently started making a neighborhood and made all the families in bodyshop and was able to put them together in CAS. I did this all in one sitting, and once I tried to get to the last family the game always crashed at a certain point when working on a sim. I've attempted this 3 times, and cas would always LOAD. I tried the next day, and the neighborhood screen loads normally but then cas is just black. It's literally nothing. I don't know what could be affecting my game, I even got rid of conflicting CC and messed with my graphic rules settings and I have the 4gb patch installed. I currently use Sims2RPC for the separates4all patch, but it does this same thing through the base game launcher. I have ultimate collection, as well.

https://imgur.com/a/21E5CZh