[ZIZope] problema di import

ciao a tutti,
uso Zope2.9 e ho un errore nel seguente script:
>>>import sys
>>>sys.path.append("/usr/lib/zope2.9/lib/python")
>>>from ZPublisher.Client import Function

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/zope2.9/lib/python/ZPublisher/__init__.py", line 24, in ?
    from Publish import publish_module, Retry
  File "/usr/lib/zope2.9/lib/python/ZPublisher/Publish.py", line 20, in ?
    from Request import Request
  File "/usr/lib/zope2.9/lib/python/ZPublisher/Request.py", line 13, in ?
    import HTTPRequest
  File "/usr/lib/zope2.9/lib/python/ZPublisher/HTTPRequest.py", line 18,
in ?
    from BaseRequest import BaseRequest
  File "/usr/lib/zope2.9/lib/python/ZPublisher/BaseRequest.py", line 21,
in ?
    from zope.event import notify
ImportError: No module named event

uso debian etch.

cose strane:
- la stessa versione di python (2.4) e zope (2.9.6-4etch1), non da
problemi su altre macchine (ho provato su altre 3 macchine)
- reinstallando zope non cambia nulla

a qualcuno è capitato?

grazie,
Fabio
-- 

Dott. Fabio Marcone

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