Fatal error: Uncaught Exception: Error: Column 'product_id' in field list is ambiguous<br />Error No: 1052<br />SELECT product_id FROM oc_order_product op INNER JOIN `oc_order` o ON o.order_id = op.order_id INNER JOIN oc_product_to_category pc on pc.product_id = op.product_id AND pc.category_id='191' GROUP BY op.product_id ORDER BY op.quantity/DATEDIFF(CURDATE(),o.date_added) DESC LIMIT 0,8 in /home/pakaiank/public_html/fixprint.id/system/library/db/mysqli.php:40 Stack trace: #0 /home/pakaiank/public_html/fixprint.id/system/library/vendor/isenselabs/nitropack/core/nitro_db.php(82): DB\MySQLi->query('SELECT product_...', Array) #1 /home/pakaiank/public_html/fixprint.id/storage/fixprint/modification/system/library/db.php(66): NitroDb->query('SELECT product_...') #2 /home/pakaiank/public_html/fixprint.id/catalog/model/extension/module/product_slider.php(525): DB->query('SELECT product_...') #3 /home/pakaiank/public_html/fixprint.id/storage/fixprint/modification/system/engine/loader.php(256): ModelExtensionModuleProductSlide in /home/pakaiank/public_html/fixprint.id/system/library/db/mysqli.php on line 40