LDAP + MySQL

Hi,

I'm trying to setup a ldap based authentication and mysql backend for the roasters, offline, etc. LDAP stuff works perfectly.
For mysql I have followed every step in http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with...
but there is not any traffic against remote mysql (tcpdump verified).
I think mysql*.beam are in place (ejabberd ebin directory), but the fact is that I got the same error if I remove them:

On client logon after authentication:

=ERROR REPORT==== 5-May-2006::13:07:51 ===
E(<0.291.0>:ejabberd_hooks:172): {noproc,
                                     {gen_server,
                                         call,
                                         ['ejabberd_odbc_sup_jwchat.domain.com',
                                          which_children,
                                          infinity]}}
running hook: {unset_presence_hook,["usuario","jwchat.domain.com","jwchat",[]]}

If the client tries to add a contact I got a similar error.
ejabberd.cfg odbc line:

{odbc_server, {mysql, "192.168.1.230", "ejabberd", "ejabberd", "XXXXX"}}.

I would like to debug it on erlang shell... but I have no time.

Any idea? Thank you very much!