exception in port delete

I stoped df-l3-agent, df-controller and q-svc and started them again

I got the following exception. I am not able to ping from the VM to default GW any more !

Exception in log:
2016-04-18 11:25:06.767 DEBUG dragonflow.db.api_nb [-] Event update: Action:delete, Table:ovsinterface, Key:ee4c5ba5-4a2d-44d0-8080-34d7695dd750 Value:uuid:ee4c5ba5-4a2d-44d0-8080-34d7695dd750, ofport:3, name:qr-a71e2af6-66, admin_state:down, type:vm, iface_id:a71e2af6-663c-4533-bcba-0dffa30dea62, peer:, attached_mac:fa:16:3e:e7:2c:d4, remote_ip:, tunnel_type: Topic:None from (pid=2144) _read_db_changes_from_queue /opt/stack/dragonflow/dragonflow/db/api_nb.py:160
2016-04-18 11:25:06.767 INFO dragonflow.controller.topology [-] The logical port({u'parent_name': None, u'macs': [u'fa:16:3e:e7:2c:d4'], u'name': u'a71e2af6-663c-4533-bcba-0dffa30dea62', u'chassis': u'ubuntu', u'lswitch': u'009ccb15-168d-437a-afbe-2b3f301036c8', u'enabled': True, u'topic': u'b7f25c3da14b42d3891ffe2fce44ac5c', u'ips': [u'fdd9:ac58:90cc::1'], u'device_owner': u'network:router_interface', u'port_security': [u'fa:16:3e:e7:2c:d4'], u'tunnel_key': 5, u'external_ids': {u'neutron:port_name': u''}, u'tag': None, u'security_groups': None}{'is_local': True, 'local_network_id': 1}) is offline
2016-04-18 11:25:06.767 INFO dragonflow.controller.df_local_controller [-] Removing local logical port = {u'parent_name': None, u'macs': [u'fa:16:3e:e7:2c:d4'], u'name': u'a71e2af6-663c-4533-bcba-0dffa30dea62', u'chassis': u'ubuntu', u'lswitch': u'009ccb15-168d-437a-afbe-2b3f301036c8', u'enabled': True, u'topic': u'b7f25c3da14b42d3891ffe2fce44ac5c', u'ips': [u'fdd9:ac58:90cc::1'], u'device_owner': u'network:router_interface', u'port_security': [u'fa:16:3e:e7:2c:d4'], u'tunnel_key': 5, u'external_ids': {u'neutron:port_name': u''}, u'tag': None, u'security_groups': None}{'is_local': True, 'local_network_id': 1}
2016-04-18 11:25:06.768 ERROR dragonflow.controller.topology [-] Failed to process logical port offline event a71e2af6-663c-4533-bcba-0dffa30dea62
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology Traceback (most recent call last):
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/topology.py", line 176, in _vm_port_deleted
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self.controller.logical_port_deleted(lport_id)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/df_local_controller.py", line 238, in logical_port_deleted
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self.open_flow_app.notify_remove_local_port(lport)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/ryu_base_app.py", line 89, in notify_remove_local_port
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self.dispatcher.dispatch('remove_local_port', lport=lport)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/dispatcher.py", line 43, in dispatch
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology handler(*args, **kwargs)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/l2_app.py", line 123, in remove_local_port
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology match=match)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/opt/stack/dragonflow/dragonflow/controller/df_base_app.py", line 85, in mod_flow
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology datapath.send_msg(message)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/controller/controller.py", line 289, in send_msg
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology msg.serialize()
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_parser.py", line 211, in serialize
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self._serialize_body()
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 2655, in _serialize_body
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology match_len = self.match.serialize(self.buf, offset)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 999, in serialize
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology return self.serialize_old(buf, offset)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 1242, in serialize_old
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology f.serialize(buf, field_offset)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 1702, in serialize
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self.put(buf, offset, self.value)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 1719, in put
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology self._put(buf, offset + self.length, value)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py", line 1709, in _put
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology msg_pack_into(self.pack_str, buf, offset, value)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology File "/usr/local/lib/python2.7/dist-packages/ryu/lib/pack_utils.py", line 25, in msg_pack_into
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology buf += struct.pack(fmt, *args)
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology error: cannot convert argument to integer
2016-04-18 11:25:06.768 TRACE dragonflow.controller.topology