Fatal error: Uncaught Error: Class "Doctrine\DBAL\Event\SchemaEventArgs" not found in /home/technoon/public_html/askon/vendor/doctrine/dbal/src/Event/SchemaAlterTableChangeColumnEventArgs.php:16 Stack trace: #0 {main} thrown in /home/technoon/public_html/askon/vendor/doctrine/dbal/src/Event/SchemaAlterTableChangeColumnEventArgs.php on line 16