1. Upgrade to sh404SEF® v2.0 or greater.
2. Create a menu item to an uncategorized article and note the itemId in the Menu Manager (i.e. "24").
3. Configure the appropriate modules for the menu item created in (2), above.
4. In the sh404SEF® Error Page configuration panel, enter the item ID of a menu item created in (2), above. You may also use the itemId of an existing menu item that already has the modules appropriate for an error page.