Clone rails with hg-git error

pulling from git://github.com/rails/rails.git
importing Hg objects into Git
Counting objects: 120804, done.
Compressing objects: 100% (26226/26226), done.
Total 120804 (delta 93276), reused 120579 (delta 93128)
importing Git objects into Hg
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** unknown exception encountered, details follow
** report bug details to http://mercurial.selenic.com/bts/
** or mercurial@selenic.com
** Mercurial Distributed SCM (version e3ce0c30798b)
** Extensions loaded: extdiff, mq, patchbomb, fetch, convert, prompt, gestalt, kilnauth, svnblame, hggit, bookmarks
Traceback (most recent call last):
  File "hg", line 36, in <module>
  File "mercurial\dispatch.pyo", line 16, in run
  File "mercurial\dispatch.pyo", line 30, in dispatch
  File "mercurial\dispatch.pyo", line 46, in _runcatch
  File "mercurial\dispatch.pyo", line 452, in _dispatch
  File "mercurial\dispatch.pyo", line 320, in runcommand
  File "mercurial\dispatch.pyo", line 504, in _runcommand
  File "mercurial\dispatch.pyo", line 457, in checkargs
  File "mercurial\dispatch.pyo", line 451, in <lambda>
  File "mercurial\util.pyo", line 402, in check
  File "mercurial\extensions.pyo", line 103, in wrap
  File "mercurial\util.pyo", line 402, in check
  File "C:\Documents and Settings\rock/bin/prompt.py", line 289, in _pull_with_cache
    res = orig(ui, repo, *args, **opts)
  File "mercurial\util.pyo", line 402, in check
  File "mercurial\commands.pyo", line 2300, in pull
  File "c:\code\environment\hg-git\hggit\hgrepo.py", line 12, in pull
    git.fetch(remote.path, heads)
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 106, in fetch
    self.import_git_objects(remote_name, refs)
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 402, in import_git_objects
    self.import_git_commit(commit)
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 412, in import_git_commit
    files = self.get_files_changed(commit)
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 804, in get_files_changed
    all_changes.extend(filenames(otree, ptree, ''))
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 781, in filenames
    prefix + bname + '/'))
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 781, in filenames
    prefix + bname + '/'))
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 781, in filenames
    prefix + bname + '/'))
  File "c:\code\environment\hg-git\hggit\git_handler.py", line 768, in filenames
    if bname in comptree:
TypeError: argument of type 'Blob' is not iterable