[Zope] ZCatalog "AttributeError: __call__" error

Hello, I am running Zope 2.5.0. I am able to create a ZCatalog in some folders and to "Find and Catalog" objects in it, but in some other folders when I try to "Find and Catalog" objects I get an "AttributeError: __call__" error. Does anybody has an idea where this error comes from? Thanks a lot, Rémi ============================== The error log is: catalogObject File /usr/local/zope/2-5-0/lib/python/Products/ZCatalog/Catalog.py, line 423, in recordify AttributeError: __call__