Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Exception\ConnectionException' not found in /home/edmedu/www/edmeducation.co.kr/tw-dev/vendor/doctrine/dbal/lib/Doctrine/DBAL/Exception/ConnectionLost.php:8 Stack trace: #0 {main} thrown in /home/edmedu/www/edmeducation.co.kr/tw-dev/vendor/doctrine/dbal/lib/Doctrine/DBAL/Exception/ConnectionLost.php on line 8