Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 924, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1124, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 689, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 711, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad/__init__.py", line 363, in run
    reviews, staging, approve=approve)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad/lp_propose.py", line 81, in __init__
    self.launchpad, source_branch)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad/lp_api.py", line 218, in from_bzr
    lp_branch = launchpad.branches.getByUrl(url=url)
  File "/usr/lib/python2.7/dist-packages/lazr/restfulclient/resource.py", line 558, in __call__
    url, in_representation, http_method, extra_headers=extra_headers)
  File "/usr/lib/python2.7/dist-packages/lazr/restfulclient/_browser.py", line 242, in _request
    str(url), method=method, body=data, headers=headers)
  File "/usr/lib/python2.7/dist-packages/lazr/restfulclient/_browser.py", line 211, in _request_and_retry
    url, method=method, body=body, headers=headers)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 1129, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/lib/pymodules/python2.7/launchpadlib/launchpad.py", line 125, in _request
    LaunchpadOAuthAwareHttp, self)._request(*args)
  File "/usr/lib/python2.7/dist-packages/lazr/restfulclient/_browser.py", line 130, in _request
    redirections, cachekey)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 901, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 871, in _conn_request
    response = conn.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1025, in getresponse
    response = self.response_class(*args, **kwds)
  File "/usr/lib/python2.7/httplib.py", line 346, in __init__
    self.fp = sock.makefile('rb', 0)
AttributeError: 'NoneType' object has no attribute 'makefile'