Sphinxでpeer networksを含むmake htmlに失敗する。

以下のpeer networksを含むdiagをmake htmlすると

diag {
  inet [shape = cloud];
  inet -- router;

  network {
    router;
    web01;
    web02;
  }
}

以下のようにエラーになってしまいます。

sphinx-build -b html -d _build/doctrees   . _build/html
Running Sphinx v1.1
WARNING: extension 'sphinxjp.themes.solarized' has no setup() function; is it really a Sphinx extension module?
loading pickled environment... done
building [html]: targets for 1 source files that are out of date
updating environment: 0 added, 1 changed, 0 removed
reading sources... [100&#37;] index                                                                                                                                 
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100&#37;] index                                                                                                                                  
Exception occurred:
  File "/usr/local/Cellar/python/2.7.2/lib/python2.7/site-packages/blockdiag/imagedraw/filters/linejump.py", line 43, in _find_method
    &#37; (self.target.__class__.__name__, name))
AttributeError: ImageDrawEx instance has no attribute 'image'
The full traceback has been saved in /var/folders/Sw/SwmqTe3uEZKnEok2z3fhLE+++TI/-Tmp-/sphinx-err-UssAeq.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
Either send bugs to the mailing list at <http://groups.google.com/group/sphinx-dev/>,
or report them in the tracker at <http://bitbucket.org/birkenfeld/sphinx/issues/>. Thanks!
make: *** [html] Error 1

shell returned 2

Press ENTER or type command to continue

Bitbucket: https://bitbucket.org/blockdiag/nwdiag/issue/2
Originally reported by: Takahiro MINAMI
Originally created at: 2011-10-10T01:36:40.406

blockdiag / nwdiag

Sphinxでpeer networksを含むmake htmlに失敗する。 #2