I am currently porting a Zope 2.7 application to Zope 2.13. I receive the following error while rendering some persistent ZPTs... how to deal with that? 2017-01-04 13:15:13 ERROR Zope.SiteErrorLog 1483532113.350.552179133409 http://10.162.62.85:12080/error_log/manage_main Traceback (innermost last): Module ZPublisher.Publish, line 138, in publish Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 48, in call_object Module Shared.DC.Scripts.Bindings, line 322, in __call__ Module Shared.DC.Scripts.Bindings, line 359, in _bindAndExec Module Products.PageTemplates.PageTemplateFile, line 130, in _exec Module Products.PageTemplates.PageTemplate, line 89, in pt_render Module zope.pagetemplate.pagetemplate, line 113, in pt_render Module zope.tal.talinterpreter, line 271, in __call__ Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 531, in do_optTag_tal Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 742, in do_insertStructure_tal Module Products.PageTemplates.Expressions, line 218, in evaluateStructure Module zope.tales.tales, line 696, in evaluate - URL: manage_main - Line 1, Column 0 - Expression: <PathExpr standard:'context/manage_page_header'> - Names: {'container': <SiteErrorLog at /error_log>, 'context': <SiteErrorLog at /error_log>, 'default': <object object at 0x30026b58>, 'here': <SiteErrorLog at /error_log>, 'loop': {}, 'nothing': None, 'options': {'args': ()}, 'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x315f5dc4>, 'request': <HTTPRequest, URL=http://10.162.62.85:12080/error_log/manage_main>, 'root': <Application at >, 'template': <PageTemplateFile at /error_log/main>, 'user': <User 'aj'>} Module zope.tales.expressions, line 217, in __call__ Module Products.PageTemplates.Expressions, line 155, in _eval Module Products.PageTemplates.Expressions, line 105, in render Module Products.PageTemplates.ZRPythonExpr, line 67, in call_with_ns TypeError: RestrictedDTMLMixin.__new__(Rtd) is not safe, use TemplateDict.__new__()