Fatal error: Uncaught Error: Class "Doctrine\DBAL\Exception" not found in /home/alkhalaffamily/public_html/teachme/vendor/doctrine/dbal/src/Exception/InvalidLockMode.php:12 Stack trace: #0 {main} thrown in /home/alkhalaffamily/public_html/teachme/vendor/doctrine/dbal/src/Exception/InvalidLockMode.php on line 12