Apology's if answered elsewhere i did search but found only simular not the same error

After i added a link using advance menu manager i now get this at the top of the page

Warning:  [mysql error 1054] Unknown column 'i.tn_ext' in 'field list'
SELECT i.id as image_id, i.file as image_file, i.comment, i.path, i.tn_ext, c.id as catid, c.name, c.permalink, RAND() as rndvalue, i.name as imgname FROM piwigo_categories c, piwigo_images i, piwigo_image_category ic WHERE c.id = ic.category_id
            AND ic.image_id = i.id
            AND i.level <= 8  AND c.id NOT IN (0)  ORDER BY rndvalue LIMIT 0,25 in C:\xampp\htdocs\mikes_photography\piwigo\include\dblayer\functions_mysql.inc.php on line 770

Does anyone know why and how to correct it , i am ok at editing php , css etc but not coding it sorry