Trier 4 forme_list_sort_on form_sort base_sort_on POST UTF-8 ISO-8859-1 false Default sort_order ListField 1 1 0 0 [('Ascending', 'ascending'), ('Descending', 'descending')] 1 1 sort_order 0 0 The input failed the external validator. Input is required but no input given. You selected an item that was not in the list.