Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Driver\Mysqli\MysqliException' not found in /home/app/htdocs/message_gateway/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/Mysqli/Exception/ConnectionFailed.php:19 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/Mysqli/Exception/ConnectionFailed.php on line 19