Fatal error: Uncaught Exception: Error: Unknown column 'op.quantity' in 'field list'<br />Error No: 1054<br />SELECT op.product_id, SUM(op.quantity) AS total FROM oc_order_product op LEFT JOIN `oc_order` o ON (op.order_id = o.order_id) LEFT JOIN `oc_product` p ON (op.product_id = p.product_id) LEFT JOIN `oc_product_to_category` ptc ON op.product_id = ptc.product_id WHERE o.order_status_id > '0' AND ptc.category_id= '32' AND p.status = '1' AND p.date_available <= NOW() GROUP BY op.product_id ORDER BY total DESC LIMIT 6 in /home/birnumara/public_html/system/library/db/mysqli.php:40 Stack trace: #0 /home/birnumara/public_html/system/library/db.php(45): DB\MySQLi->query('SELECT op.produ...') #1 /home/birnumara/public_html/storagexL/modification/catalog/model/catalog/product.php(1305): DB->query('SELECT op.produ...') #2 /home/birnumara/public_html/vqmod/vqcache/vq2-storagexL_modification_system_engine_loader.php(264): ModelCatalogProduct->getBestSellerProductsCategory(6, '32') #3 /home/birnumara/public_html/system/engine/proxy in /home/birnumara/public_html/system/library/db/mysqli.php on line 40