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ActionView::TemplateError (Mysql2::Error: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'sustainatwork_fr.categories.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by: SELECT * FROM `categories` GROUP BY id_categorie ORDER BY id_categorie ASC) on line #1 of app/views/events/_lien_direct.html.erb: 1: <% @categories = Categorie.find(:all, :order => 'id_categorie ASC', :group => 'id_categorie') %> 2: <% for categorie in @categories %><%= 3: link_to(image_tag("/images/structure/boutons/lien_direct_categorie_#{categorie.id_categorie}.jpg", :border=>0),"/agenda_#{categorie.label_categorie.downcase.removeaccents}") -%>