无法更改“站点设置”中的“类型设置”

Question

我正在尝试更改站点设置中的“类型设置”。默认值为Simple Publication Workflow。当我尝试将其更改为Intranet工作流或社区工作流或任何其他工作流时，我收到此错误：

    Traceback (innermost last):
      Module ZPublisher.Publish, line 126, in publish
      Module ZPublisher.mapply, line 77, in mapply
      Module ZPublisher.Publish, line 46, in call_object
      Module plone.app.controlpanel.types, line 165, in __call__
      Module zope.event, line 23, in notify
      Module zope.component.event, line 24, in dispatch
      Module zope.component._api, line 136, in subscribers
      Module zope.component.registry, line 321, in subscribers
      Module zope.interface.adapter, line 583, in subscribers
      Module plone.app.discussion.browser.controlpanel, line 181, in notify_configuration_changed
    AttributeError: 'NoneType' object has no attribute 'forInterface'

有人可以提供建议吗？

我们正在使用plone 4.1

非常感谢。

Cmgui