如何清理groupdashboard picklingError

Question

在已迁移的Plone网站（3.3 - > 4.0）上，我无法应用“portlet”步骤。

追溯：

2013-01-23 12:15:51 ERROR Zope.SiteErrorLog 1358939751.450.337074106184 http://localhost:8080/plone/portal_quickinstaller/prefs_reinstallProducts
Traceback (innermost last):
  Module ZPublisher.Publish, line 135, in publish
  Module Zope2.App.startup, line 291, in commit
  Module transaction._manager, line 93, in commit
  Module transaction._transaction, line 322, in commit
  Module transaction._transaction, line 416, in _commitResources
  Module ZODB.Connection, line 558, in commit
  Module ZODB.Connection, line 606, in _commit
  Module ZODB.Connection, line 640, in _store_objects
  Module ZODB.serialize, line 422, in serialize
  Module ZODB.serialize, line 431, in _dump
PicklingError: Can't pickle <class 'collective.groupdashboard.interfaces.IGroupDashboardLayer'>: import of module collective.groupdashboard.interfaces failed

我是否需要将此插件添加回我的设置，还是可以在没有它的情况下删除此实例？有没有办法伪造这个类然后删除它？

我不知道如何删除那些东西。任何解决方法都欢迎！