Replace get_categories by categories

app/helpers/admin/frontend_widget_interface.rb

@@ -3,7 +3,7 @@ module Admin::FrontendWidgetInterface
 protected
   def get_categories_and_tags
     unless @selected[:module_app].nil?
-      @categories = @selected[:module_app].get_categories 
+      @categories = @selected[:module_app].categories 
       @tags = @selected[:module_app].tags
     end
   end