Courtney,
When you initially registered in the system, did you use your Passport number as your log-in, or did you create username?
When I first registered, I entered a username into that field instead of my Passport number. This proved to be a mistake because once I entered my Passport number while filling out the CV, the system changed my log-in to my Passport number and I had to use that to log-in from then on. I was getting the message you describe above before I figured this out.
I'm not sure if this is your problem, but perhaps by some luck it is!