I'm having a similar problem. In my case, I don't have the Sims 4 Pets expansion though.... I tried to play without Mods/CC and it seems to work but I haven't been able to identify which is the mod causing the error as they used to work fine before the Pets Expansion update. I have tried extracting the suspicious mods and cc out of the Sims 4 Mods file but it just doesn't work.
To be more precise, I'm having the Error Code 123.9d5d0e8f : c5778048. Anyone else with the same error?? Any of you have any ideas of what could be happening?
Thanks