code: def __error_message(self,stanza):
          
          fr=stanza.get_from()
          key=fr.bare().as_unicode()
          rs=self.rooms.get(key)
          if not rs:
              return False
          rs.process_error_message(stanza)
          return True
docs: Process an error message from a MUC room.
  
          :Parameters:
              - `stanza`: the stanza received.
          :Types:
              - `stanza`: `Message`
  
          :return: `True` if the message was properly recognized as directed to
              one of the managed rooms, `False` otherwise.
          :returntype: `bool`