I had the same problem earlier today and submitted a ticket. However, I was trying to think of anything I may have changed in the last day or so, so that I might be able to get my registration process back up and running.
I had changed my cut off dates for registrations to be a couple days after the class started (driver\'s ed website), as we are able to take registrations up until the 3rd class.
I went back and changed these again, and it apparently fixed the problem. The error no longer appears and I can submit my registrations. (The cut off date was the only thing I changed, so that I would know if that is what affected the error)
I have responded to my ticket, as I am guessing this is still a bug, because the cut-off date and the email validation seem like they should not be at all related.
My registrations are working, but I would like to know if this will be fixed so that we are able to take late registrations.