Page does not exist when trying to submit url?

I'm trying to submit a website from:

http://dmoz.org/cgi-bin/add.cgi?where=Computers/Usenet/Web_Based

and after entering the information I get:

http://dmoz.org/cgi-bin/addnew.cgi

The page you attempted to access does not exist on this site.
The closest matches are:

Open Directory Main Page

Any ideas why? I've tried clearing my browser cache but nothing works...

See this thread for more details.