Jigasi unable to join conference

When I call the sip extension jigasi is registered the call is not answered. Looking at the log I see after a lot of traffic that seems to be ok that jigasi tries to enter a conference like:

<presence to="teto@conference.domain/167619bfa72" id="1EIiO-92">
  <x xmlns="http://jabber.org/protocol/muc"/>
  <x xmlns="vcard-temp:x:update">
    <photo/>
  </x>
  <c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://jitsi.org" ver="FE7NXZo0MGr7DOL5ZtzsTLTvwu8="/>
</presence>

but it gets this error:

<presence to="agente@domain/167619bfa72" from="teto@conference.domain/167619bfa72" id="1EIiO-92" type="error">
  <x xmlns="http://jabber.org/protocol/muc" xmlns:stream="http://etherx.jabber.org/streams"/>
  <x xmlns="vcard-temp:x:update" xmlns:stream="http://etherx.jabber.org/streams">
    <photo xmlns:stream="http://etherx.jabber.org/streams"/>
  </x>
  <c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://jitsi.org" ver="FE7NXZo0MGr7DOL5ZtzsTLTvwu8="/>
  <error type="cancel">
    <item-not-found xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/>
  </error>
</presence>

I don’t see any errors on the openfire log file. Any ideas what the item-not-found error means? I can see the conference from a pidgin client connected to openfire.