Error in game

In The Sims, I can create a character, dress them, and save them to my library, although I started getting an error there too. But when I buy a house and start a new game, I can't enter it. The game glitches, and on the left side I see some blue squares. I can't enter the household at all. I can click to start over, but if I try to load another family, it glitches every time anyway. I thought it was caused by mods or something, but I removed all the new mods, and this wasn't happening before, so I think it must have been caused by the update. I don't know what to do because I'd really like to play, but I can't.