[Zope] Error defining permissions in ZClass in Zop3-2.3

When I want to define a permission a ZClass or a folder in a ZClass with the management - Interface in Zope 2.3, I alwasy get the following error message: Error Type: TypeError Error Value: too many arguments; expected 2, got 3 When I did exactly the same thing under the same circumstances in Zope-2.2.5, it worked fine. Because of this error, it's now impossible to access a dtml-method in a folder in a ZClassby an object of this ZClass. Has anybody an indea what I'm might doing wrong, or what has changed in 2.3 that I have to do it differently an how? Or ist this simply a bug? Thanks, Klaus