Nostalrius Begins - Quality wow vanilla realm (1.12)

I have been unable to register a game account from the Nostalrius homepage after several repeated attempts. I've tried on both Firefox and Internet Explorer but whenever I press submit I get redirected to a blank page that says:
{"result":false,"message":"Please fill the form correctly"}

I've tried many times with no success, tried several different user names, emails and passwords and I've had no luck, always getting the same error. I've done about everything I can think of. Any suggestions?

Try registering from a mobile device (Tablet or smart phone) or another computer if possible.

No dice, I tried on my phone and ipad with different browsers and I'm still getting the same error