spam_riak output

(crawler)will% python spam-riak.py
Obj has 159 links
Obj has 248 links
Traceback (most recent call last):
  File "spam-riak.py", line 29, in <module>
    single_obj.store()
  File "/Users/will/.venvs/crawler/lib/python2.6/site-packages/riak/riak_object.py", line 296, in store
    Result = t.put(self, w, dw, return_body)
  File "/Users/will/.venvs/crawler/lib/python2.6/site-packages/riak/transports/http.py", line 127, in put
    return self.parse_body(response, [200, 201, 300])
  File "/Users/will/.venvs/crawler/lib/python2.6/site-packages/riak/transports/http.py", line 238, in parse_body
    self.check_http_code(response, expected_statuses)
  File "/Users/will/.venvs/crawler/lib/python2.6/site-packages/riak/transports/http.py", line 224, in check_http_code
    raise Exception(m)
Exception: Expected status [200, 201, 300], received 400