Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Connection' not found in /opt/lampp/htdocs/kuesioner/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php:69 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php on line 69