[Zope] Error publishing resource

[Garito]

Hi all

I have some code like these:

def __bobo_traverse__(self, REQUEST, name):
    obj = getattr(self, name, None)
        if obj is not None:
            return obj
        else:
            return 'cocohuaha'

But zope raise an The object at http://myserver:8080/TestingZope/Test is 
not publishable.

Why?

Thank you!