I'm not sure what happened there, but is it possible he could have received a n old registration link? If so, he's going to have to wait a little longer until registration is open, so keep an eye out X3
As explained in the earlier comments the registrations open at random times - your friend will need to register when it's open. You can read more about the reason why here (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=27243.0)
Locking this thread.