FlowMultipartRequestがエラーになる about trema-edge HOT 2 CLOSED

class Sample < Controller
  def switch_ready datapath_id
    action = SetField.new( action_set: [ EthSrc.new( mac_address: Trema::Mac.new( "00:00:00:00:00:01" ) ) ] )
    ins = ApplyAction.new( actions: [ action ] )
    send_flow_mod_add( datapath_id, instructions: [ ins ] )
    send_flow_multipart_request( datapath_id, cookie: 0 )
  end
  def flow_multipart_reply datapath_id, message
    p message
  end
end