Adding the first user (MySQL-native)

I just set up my first ejabberd on a Gentoo server. I wanted to use MySQL as my database, so I've downloaded and installed the Erlang MySQL module and tweaked the config file to support it. ejabberd starts fine, but I can't add a user:

djc@enrai bin $ sudo ejabberdctl djc@manuzhai.nl register admin manuzhai.nl ***
RPC failed on the node 'djc@manuzhai.nl': nodedown

=ERROR REPORT==== 27-Feb-2007::15:49:38 ===
** System NOT running to use fully qualified hostnames **
** Hostname manuzhai.nl is illegal **

I have this in my config file:

{hosts, ["manuzhai.nl", "hebe.nl"]}.
{auth_method, odbc}.
{odbc_server, {mysql, "localhost", "ejabberd", "Manuzhai", "***"}}.

How can I get this to work?