Error code 34

This is the second time this has happened to me. I’m just playing sims and saving regularly and it all seems fine until it says it can’t save because of error code : 34. 

I can’t start from where I last saved. It just makes me start a new game. 

This is EXTREMELY vital to fix this as soon as possible! It makes playing the game absolutely IMPOSSIBLE.

Please do something about this!! Or give me a refund on all or at least the last expansion pack that I bought (cottage living) that seems to have started this.