item.store()
  File "/usr/local/lib/python2.7/dist-packages/riak/riak_object.py", line 281, in store
    timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 127, in wrapper
    return self._with_retries(pool, thunk)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 69, in _with_retries
    return fn(transport)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 125, in thunk
    return fn(self, transport, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/operations.py", line 289, in put
    timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/transport.py", line 194, in put
    MSG_CODE_PUT_RESP)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 43, in _request
    return self._recv_msg(expect)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 59, in _recv_msg
    raise Exception("unknown msg code %s" % msg_code)
Exception: unknown msg code 44