i visit a online registration website randomly page by page to complete my registration. when submit a page to get next page then its seems a error massages.

i visit a online registration website randomly page by page to complete my registration. when submit a page to get next page then its seems a error massages like this "The Problem may be due to 500 Server Error/404 Page Not Found.Please contact your system administrator". But when I try from another browser specially opera old version like 12.16, then I'm success to complete.