17:00:35 [I] Bootstrapping "booty" in "/home/elliot/merge/booty/test"
17:00:35 [D] hg not found as new-style vcs, trying as monolithic
17:00:35 [I] Initializing new repository in '/home/elliot/merge/booty/test/hg_side'...
17:00:35 [C] Cannot prepare working directory!
Traceback (most recent call last):
  File "/home/elliot/darcs/tailor/tailor", line 35, in ?
    main()
  File "/home/elliot/darcs/tailor/vcpx/tailor.py", line 339, in main
    tailorizer()
  File "/home/elliot/darcs/tailor/vcpx/tailor.py", line 144, in __call__
    self.bootstrap()
  File "/home/elliot/darcs/tailor/vcpx/tailor.py", line 67, in bootstrap
    dwd.prepareWorkingDirectory(self.source)
  File "/home/elliot/darcs/tailor/vcpx/target.py", line 550, in prepareWorkingDirectory
    self._prepareWorkingDirectory(source_repo)
  File "/home/elliot/darcs/tailor/vcpx/repository/hg.py", line 445, in _prepareWorkingDirectory
    message = 'Tailor preparing to convert repo by adding .hgignore')
  File "/home/elliot/darcs/tailor/vcpx/repository/hg.py", line 346, in _hgCommand
    allopts = self._defaultOpts(cmd)
  File "/home/elliot/darcs/tailor/vcpx/repository/hg.py", line 341, in _defaultOpts
    return dict([(f[1].replace('-', '_'), f[2]) for f in findcmd(cmd)[1][1]])
  File "/home/elliot/darcs/tailor/vcpx/repository/hg.py", line 330, in findcmd
    return cmdutil.findcmd(self._getUI(), cmd)
TypeError: findcmd() takes exactly 3 arguments (2 given)