I think it's the RFB Password. It must be a "strong password". In other words, it needs to have 1 upper, 1 lower, one number, and one special character. EG P@ssw0rd. Also, it must be exactly 8 characters. Let me know if that helps.
Thanks Jake, that's exactly what it was. I appreciate your help. Both the documentation and the error message could be improved on this poiint.