Error when creating a new user

I don't think that's an option right now as we would like the site to go live by tomorrow afternoon and I've never backed up before and don't have the time to play around with that right now. I was at the point where I was creating the clients account and that's when I noticed the error. Hopefully someone at IT will know what I can do to fix this. It looks like a syntax error so maybe I just need to change something in the backend code. Anyways. it's not stopping me from doing anything so I can't complain to much.