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在 Plone UnifiedInstaller 4.2.5 上运行 paster 我收到以下错误。对这个问题有任何想法吗？

Traceback (most recent call last):
  File "../bin/paster", line 382, in <module>
    import paste.script.command
  File "/var/plone/my.app/buildout-cache/eggs/PasteScript-1.7.5-py2.7.egg/paste/script/command.py", line 3, in <module>
    import pkg_resources
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2835, in <module>
    add_activation_listener(lambda dist: dist.activate())
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 704, in subscribe
    callback(dist)
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2835, in <lambda>
    add_activation_listener(lambda dist: dist.activate())
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2262, in activate
    map(declare_namespace, self._get_metadata('namespace_packages.txt'))
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 1847, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/var/plone/my.app/buildout-cache/eggs/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 1817, in _handle_ns
    loader.load_module(packageName); module.__path__ = path
  File "/usr/lib/python2.7/pkgutil.py", line 246, in load_module
    mod = imp.load_module(fullname, self.file, self.filename, self.etc)
  File "/var/plone/my.app/buildout-cache/eggs/ZopeSkel-2.21.2-py2.7.egg/zopeskel/__init__.py", line 2, in <module>
    from zopeskel.basic_namespace import BasicNamespace
  File "/var/plone/my.app/buildout-cache/eggs/ZopeSkel-2.21.2-py2.7.egg/zopeskel/basic_namespace.py", line 2, in <module>
    from zopeskel.vars import var, DottedVar, StringVar, BooleanVar, TextVar
  File "/var/plone/my.app/buildout-cache/eggs/ZopeSkel-2.21.2-py2.7.egg/zopeskel/vars.py", line 2, in <module>
    from paste.script.templates import var as base_var
  File "/var/plone/my.app/buildout-cache/eggs/PasteScript-1.7.5-py2.7.egg/paste/script/templates.py", line 145, in <module>
    NoDefault = command.NoDefault
AttributeError: 'module' object has no attribute 'NoDefault'

我的 base.cfg 的 zopeskel 部分有以下条目

[zopeskel]
recipe = zc.recipe.egg
eggs =
    ZopeSkel <= 2.99
    zopeskel.dexterity == 1.4.1
    zopeskel.diazotheme
    Paste
    PasteDeploy
    PasteScript
    ${buildout:eggs}

我可以运行 zopeskel 并创建一个灵巧包，但由于这个贴纸问题，我无法添加自定义内容类型。我的灵巧包已经安装在 buildout.cfg

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