[Zope] Function sequence.sort

[julian]

Hi, I have a problem with a script that run with zope2.7. This same 
script don't run with zope 2.9 ????

My error :
----------------------------------------------------------------------
2007-06-04T15:31:05 ERROR Zope.SiteErrorLog 
http://zope.mysite.com:17673/SITES/plone_site/vie-quotidienne/ind
ex_html/ecoles
Traceback (innermost last):
   Module ZPublisher.Publish, line 115, in publish
   Module ZPublisher.mapply, line 88, in mapply
   Module ZPublisher.Publish, line 41, in call_object
   Module Shared.DC.Scripts.Bindings, line 311, in __call__
   Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
   Module Products.PythonScripts.PythonScript, line 325, in _exec
   Module None, line 13, in ecoles
    - <PythonScript at /SITES/plone_site/vie-quotidienne/index_html/ecoles>
    - Line 13
   Module DocumentTemplate.sequence.SortEx, line 121, in sort
TypeError: mybrains.__cmp__(x,y) requires y to be a 'mybrains', not a 
'ImplicitAcquirerWrapper'
---------------------------------------------------------------------------------

-----------------------------------------------------------------------------------
The script:
------------------------------------------------------------------------------------
from Products.PythonScripts.standard import html_quote
request = container.REQUEST
RESPONSE =  request.RESPONSE

query = {'portal_type' : 'J_Product',
              'review_state' : 'published',
         }

resultat_ecole = context.portal_catalog.searchResults(query)

sort_on_pr = ()

tri_ecole =sequence.sort(resultat_ecole, sort_on_pr)

return tri_ecole
-------------------------------------------------------------------------------------


Julian