failed to start Docker container with network created by kuryr

hi,

follow the steps to create network and start container:
1. create network: sudo docker network create --driver=kuryr foo
2. launches a container against network foo: sudo docker run --net=foo -itd --name=container1 busybox

Error info:
127.0.0.1 - - [16/Nov/2015 08:42:53] "POST /NetworkDriver.CreateEndpoint HTTP/1.1" 200 -
ERROR:root:transaction decorator error
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 75, in decorated
    ret = f(self, direct, *argv, **kwarg)
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 398, in __setitem__
    get(key, lambda x, y: x == y)(value, tn[key]):
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/interface.py", line 58, in <lambda>
    _fields_cmp = {'flags': lambda x, y: x & y & IFF_MASK == y & IFF_MASK}
TypeError: unsupported operand type(s) for &: 'NoneType' and 'int'

ERROR:root:transaction decorator error
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 75, in decorated
    ret = f(self, direct, *argv, **kwarg)
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 405, in __delitem__
    self[key] = None
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 85, in decorated
    raise error
TypeError: unsupported operand type(s) for &: 'NoneType' and 'int'

127.0.0.1 - - [16/Nov/2015 08:42:57] "POST /NetworkDriver.Join HTTP/1.1" 500 -
INFO:werkzeug:127.0.0.1 - - [16/Nov/2015 08:42:57] "POST /NetworkDriver.Join HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/vagrant/kuryr/kuryr/controllers.py", line 586, in network_driver_join
    endpoint_id, neutron_port, all_subnets)
  File "/home/vagrant/kuryr/kuryr/binding.py", line 91, in port_bind
    host_veth.up()
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 213, in __exit__
    self.commit()
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/interface.py", line 477, in commit
    del self[i]
  File "/usr/local/lib/python2.7/dist-packages/pyroute2/ipdb/transactional.py", line 85, in decorated
    raise error
TypeError: unsupported operand type(s) for &: 'NoneType' and 'int'

could you help check?