Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Event\SchemaEventArgs' not found in /home/app/htdocs/message_gateway/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php:17 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php on line 17