[zope] Issue with manage_addPageTemplate

Hello, I just installed version 5.8.2 on python 3.11.3 When I try to add a Page Template I get the following error: Traceback (innermost last): * Module ZPublisher.WSGIPublisher, line 181, in transaction_pubevents * Module ZPublisher.WSGIPublisher, line 390, in publish_module * Module ZPublisher.WSGIPublisher, line 285, in publish * Module ZPublisher.mapply, line 85, in mapply * Module ZPublisher.WSGIPublisher, line 68, in call_object * Module Products.PageTemplates.ZopePageTemplate, line 379, in manage_addPageTemplate AttributeError: 'str' object has no attribute 'filename' Am I doing something wrong? Thanks for your help, Giampiero