[Zope] Bug in Zclasses permissions interface ?

[Ravindra]

Hi All,
  I have a product with is developed using a zClass and Python Base. I am
unable to access objects newly created using zope web interface. If I try to
change any permissions zope gives the following error:

Error Type: TypeError
Error Value: too many arguments; expected 2, got 3

Traceback .. blah.. blah ...

Thanks,
Ravin