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/builtins.py", line 4301, in run
    self._revert_tree_to_revision(tree, revision, file_list, no_backup)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 4307, in _revert_tree_to_revision
    report_changes=True)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 49, in tree_write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree.py", line 2153, in revert
    report_changes)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transform.py", line 2759, in revert
    working_tree, target_tree, tt, filenames, backups, pp)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transform.py", line 2785, in _prepare_revert_transform
    merge_modified, basis_tree)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transform.py", line 2886, in _alter_files
    tt.adjust_root_path(name[1], parent_trans)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transform.py", line 195, in adjust_root_path
    self.version_file(file_id, child_id)
  File "/usr/lib/python2.7/dist-packages/bzrlib/transform.py", line 353, in version_file
    raise ValueError()
ValueError