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 57, in _recv_msg
    msg = self._parse_msg(msg_code, self._inbuf[1:])
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 110, in _parse_msg
    pbo.ParseFromString(packet)
  File "/usr/lib/pymodules/python2.7/google/protobuf/message.py", line 179, in ParseFromString
    self.MergeFromString(serialized)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/python_message.py", line 755, in MergeFromString
    if self._InternalParse(serialized, 0, length) != length:
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/python_message.py", line 777, in InternalParse
    new_pos = local_SkipField(buffer, new_pos, end, tag_bytes)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/decoder.py", line 710, in SkipField
    return WIRETYPE_TO_SKIPPER[wire_type](buffer, pos, end)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/decoder.py", line 658, in _SkipGroup
    new_pos = SkipField(buffer, pos, end, tag_bytes)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/decoder.py", line 710, in SkipField
    return WIRETYPE_TO_SKIPPER[wire_type](buffer, pos, end)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/decoder.py", line 679, in _RaiseInvalidWireType
    raise _DecodeError('Tag had invalid wire type.')
DecodeError: Tag had invalid wire type.