An internal error occurred due to a bug in either zc.buildout or in a

recipe being used:

Traceback (most recent call last):

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 2123, in main

    getattr(buildout, command)(args)

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 680, in install

    [self[part]['recipe'] for part in install_parts]

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 680, in <listcomp>

    [self[part]['recipe'] for part in install_parts]

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 1274, in __getitem__

    options._initialize()

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 1382, in _initialize

    self.initialize()

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 1388, in initialize

    recipe_class = _install_and_load(reqs, 'zc.buildout', entry, buildout)

  File "c:\python36\lib\site-packages\zc\buildout\buildout.py", line 1338, in _install_and_load

    allow_hosts=buildout._allow_hosts

  File "c:\python36\lib\site-packages\zc\buildout\easy_install.py", line 920, in install

    return installer.install(specs, working_set)

  File "c:\python36\lib\site-packages\zc\buildout\easy_install.py", line 673, in install

    ws.add(dist)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 790, in add

    self._added_new(dist)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 990, in _added_new

    callback(dist)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 3047, in <lambda>

    add_activation_listener(lambda dist: dist.activate(replace=True), existing=False)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 2574, in activate

    fixup_namespace_packages(self.location)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 2162, in fixup_namespace_packages

    subpath = _handle_ns(package, path_item)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 2091, in _handle_ns

    _rebuild_mod_path(path, packageName, module)

  File "c:\python36\lib\site-packages\pkg_resources\__init__.py", line 2120, in _rebuild_mod_path

    orig_path.sort(key=position_in_sys_path)

AttributeError: '_NamespacePath' object has no attribute 'sort'

pip3 install --upgrade setuptools