Fatal error: Uncaught Error: Class "Doctrine\DBAL\Event\SchemaEventArgs" not found in /home/keshavvps/public_html/keshav/KG1/HAR/vendor/doctrine/dbal/src/Event/SchemaAlterTableChangeColumnEventArgs.php:18 Stack trace: #0 {main} thrown in /home/keshavvps/public_html/keshav/KG1/HAR/vendor/doctrine/dbal/src/Event/SchemaAlterTableChangeColumnEventArgs.php on line 18