Traceback (most recent call last):
  File "/usr/bin/tailor", line 5, in ?
    pkg_resources.run_script('tailor==0.9.21', 'tailor')
  File "/usr/lib/python2.4/site-packages/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 407, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.4/site-packages/setuptools-0.6a10-py2.4.egg/pkg_resources.py", line 1043, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/EGG-INFO/scripts/tailor", line 33, in ?
    main()
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/tailor.py", line 332, in main
    tailorizer()
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/tailor.py", line 141, in __call__
    self.bootstrap()
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/tailor.py", line 71, in bootstrap
    actual = dwd.checkoutUpstreamRevision(revision)
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/source.py", line 245, in checkoutUpstreamRevision
    last = self._checkoutUpstreamRevision(revision)
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/darcs.py", line 343, in _checkoutUpstreamRevision
    output = changes.execute(stdout=PIPE, stderr=STDOUT)[0]
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/shwrap.py", line 144, in execute
    return self._execute(allargs, **kwargs)
  File "/usr/lib/python2.4/site-packages/tailor-0.9.21-py2.4.egg/vcpx/shwrap.py", line 185, in _execute
    self._last_command = [chunk % kwargs for chunk in self.command]
TypeError: unsupported operand type(s) for %: 'NoneType' and 'dict'