[Zope] changing ownership

[nuno]

Hi guys !
does anyone knows how tho change / setting the ownership of an Object
with python or with DTML !!

I tried in python and it gave me the following error :

Zope Error
Zope has encountered an error while publishing this resource.

Error Type: TypeError
Error Value: cannot marshal objects



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Traceback (innermost last):
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/ZPublisher/Publish.py, line
222, in publish_module
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/ZPublisher/Publish.py, line
187, in publish
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/Zope/__init__.py,
line 221, in zpublisher_exception_hook
    (Object: Traversable)
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/ZPublisher/Publish.py, line
171, in publish
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/ZPublisher/mapply.py, line
160, in mapply
    (Object: teste)
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/ZPublisher/Publish.py, line
112, in call_object
    (Object: teste)
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/OFS/DTMLDocument.py,
line 189, in __call__
    (Object: teste)
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/DocumentTemplate/DT_String.
py, line 538, in __call__
    (Object: teste)
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/DocumentTemplate/DT_In.py,
line 713, in renderwob
    (Object: acl_users.getUsers())
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/DocumentTemplate/DT_Let.py,
line 147, in render
    (Object: user=sequence-item)
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/DocumentTemplate/DT_Let.py,
line 147, in render
    (Object: usernam="user.getUserName()")
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/DocumentTemplate/DT_Util.py
, line 337, in eval
    (Object: gtOwner(user))
    (Info: gtOwner)
  File <string>, line 0, in ?
  File
/usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/Products/ExternalMethod/Ext
ernalMethod.py, line 269, in __call__
    (Object: gtOwner)
    (Info: ((epires,), {}, None))
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/Extensions/getowner.py, line 8,
in GetOwner
    (Object: Traversable)
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/xmlrpclib.py, line
547, in __call__
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/xmlrpclib.py, line
625, in __request
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/xmlrpclib.py, line
503, in dumps
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/xmlrpclib.py, line
278, in dumps
  File /usr/local/Zope/Zope-2.3.0-linux2-x86/lib/python/xmlrpclib.py, line
289, in __dump
TypeError: (see above)