#139 — Can't create a PloneCenter on Plone 3.3.2

I created a buildout of Plone 3.3.2 and added the PHC 3.0b to it. I'm able to install the PHC as add-on. But I can't create an Help center inside my Plone site. I get an error message:
Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 42, in call_object
  Module Products.CMFFormController.FSControllerPythonScript, line 106, in __call__
  Module Products.CMFFormController.ControllerBase, line 227, in getNext
ValueError: No next action found for createObject.success.HelpCenter.None
Metadata actions:


ZMI actions:

It is the same if I try to create a KnowledgeBase