Fatal error: Uncaught Error: Class "Doctrine\DBAL\Event\SchemaEventArgs" not found in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/doctrine/dbal/src/Event/SchemaAlterTableAddColumnEventArgs.php:19 Stack trace: #0 {main} thrown in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/doctrine/dbal/src/Event/SchemaAlterTableAddColumnEventArgs.php on line 19