An internal error occured due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/zc.buildout-1.4.0-py2.4.egg/zc/buildout/buildout.py", line 1658, in main
    getattr(buildout, command)(args)
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/zc.buildout-1.4.0-py2.4.egg/zc/buildout/buildout.py", line 532, in install
    installed_files = self[part]._call(recipe.install)
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/zc.buildout-1.4.0-py2.4.egg/zc/buildout/buildout.py", line 1203, in _call
    return f()
  File "/home/webenv/plone3/buildout-cache/eggs/plone.recipe.zope2instance-4.0a3-py2.4.egg/plone/recipe/zope2instance/__init__.py", line 80, in install
    self.install_scripts()
  File "/home/webenv/plone3/buildout-cache/eggs/plone.recipe.zope2instance-4.0a3-py2.4.egg/plone/recipe/zope2instance/__init__.py", line 468, in install_scripts
    requirements, ws = self.egg.working_set(['plone.recipe.zope2instance'])
  File "/home/webenv/plone3/buildout-cache/eggs/zc.recipe.egg-1.2.2-py2.4.egg/zc/recipe/egg/egg.py", line 89, in working_set
    allow_hosts=self.allow_hosts,
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/zc.buildout-1.4.0-py2.4.egg/zc/buildout/easy_install.py", line 802, in install
    return installer.install(specs, working_set)
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/zc.buildout-1.4.0-py2.4.egg/zc/buildout/easy_install.py", line 662, in install
    ws.resolve(requirements)
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/setuptools-0.6c11-py2.4.egg/pkg_resources.py", line 570, in resolve
    requirements.extend(dist.requires(req.extras)[::-1])
  File "/home/webenv/plone3/Python-2.4/lib/python2.4/site-packages/setuptools-0.6c11-py2.4.egg/pkg_resources.py", line 2156, in requires
    raise UnknownExtra(
UnknownExtra: zope.testbrowser 0.0 has no such extra feature 'zope_functional_testing'