The Sims 2 Legacy won't let me have babies/toddlers

I recently bought the Legacy version of Sims 2 and my first sim wouldn't get pregnant. I realized after a while she wasn't making memories and only had the basic load-in ones even after getting married and graduating college. So I made a new family and created a toddler with them, and when I did, the game gave me a strange error message (pictured) and then replaced the toddler with a cat?? I don't understand what is happening. Is anyone else having this issue?