Hello there, 

Please check what exactly is the exception here. If you don't find any mistake or loophole from your side, then first, try logging into the website from either a different internet browser or try the incognito mode of Google Chrome. Sometimes due to huge traffic on a website, technical glitches occurs leading to such problems. 

If nothing mentioned above solves your problem, try contacting the authorities by mail or phone. They'll surely be able to help you out. 

Hope this helps.