Fatal error: Uncaught PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'created_at' in 'ORDER BY' in /home/pluspremium/public_html/subdomain/course/list.php:17 Stack trace: #0 /home/pluspremium/public_html/subdomain/course/list.php(17): PDO->prepare('SELECT id, titl...') #1 {main} thrown in /home/pluspremium/public_html/subdomain/course/list.php on line 17