How Do i create new users Via XMPP client in widows phone 7

Jul 11, 2012 at 7:43 AM

  i a m unable to create new user using AMPPClient.CreateAccount(usernametxtbx.Text, passwordtxtbx.Password, "");

error i get 

</query><error code='403' type='auth'><forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>