Hello, Few months ago, I send my problem with attach file with Zope 2.6 and higher. How I have no solution, I send again my problem which is described after -------- Thanks to help me Frederique --------------- I have created a zclass with zfile as basic class. With this class, users could, via a web form, send an attached file if they want. With zope 2.5 (my previous version) if users don't attach a file, there is no problem with zope 2.10, if there is no file attached, I have an error message : 'file not specified". It seems that attach file is mandatory. Here, the complete message from the events log : Traceback (innermost last): Module ZPublisher.Publish, line 119, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 42, in call_object Module OFS.DTMLMethod, line 144, in __call__ - <DTMLMethod at /assistance/do_add> - URL: http://assistance.abes.fr/do_add/manage_main - Physical Path: /assistance/do_add Module DocumentTemplate.DT_String, line 476, in __call__ Module DocumentTemplate.DT_With, line 76, in render Module DocumentTemplate.DT_Util, line 196, in eval - __traceback_info__: _ Module <string>, line 1, in <expression> Module OFS.DTMLMethod, line 137, in __call__ - <DTMLMethod at /assistance/Quest_susvp_add> - URL: http://assistance.abes.fr/Quest_susvp_add/manage_main - Physical Path: /assistance/Quest_susvp_add Module DocumentTemplate.DT_String, line 476, in __call__ Module DocumentTemplate.DT_With, line 61, in render Module DocumentTemplate.DT_Util, line 196, in eval - __traceback_info__: REQUEST Module <string>, line 1, in <expression> Module ZClasses.ZClass, line 454, in createInObjectManager Module ZClasses.ZClass, line 485, in fromRequest Module ZPublisher.mapply, line 89, in mapply Module OFS.Image, line 120, in __init__ Module OFS.Image, line 501, in _read_data ValueError: File not specified