Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 926, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1126, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 691, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 713, 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/builtins.py", line 3941, in run
    location, revision, remember, possible_transports, None)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 4049, in _get_merger_from_branch
    possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 199, in open_containing
    return control.open_branch(), relpath
  File "/usr/lib/python2.7/dist-packages/bzrlib/remote.py", line 355, in open_branch
    setup_stacking=not ignore_fallbacks, name=name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/remote.py", line 2251, in __init__
    self.tags = self._format.make_tags(self)
  File "/usr/lib/python2.7/dist-packages/bzrlib/remote.py", line 2162, in make_tags
    self._ensure_real()
  File "/usr/lib/python2.7/dist-packages/bzrlib/remote.py", line 2069, in _ensure_real
    self._network_name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/registry.py", line 254, in get
    r = Registry.get(self, format_string)
  File "/usr/lib/python2.7/dist-packages/bzrlib/registry.py", line 164, in get
    return self._dict[self._get_key_or_default(key)].get_obj()
KeyError: 'Bazaar-NG Loom branch format 7\n'