Fatal error: Uncaught Error: Class "Doctrine\DBAL\Event\SchemaEventArgs" not found in D:\Apache24\www\qilu_sap\back-end\vendor\doctrine\dbal\src\Event\SchemaIndexDefinitionEventArgs.php:13 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu_sap\back-end\vendor\doctrine\dbal\src\Event\SchemaIndexDefinitionEventArgs.php on line 13