Fatal error: Uncaught Error: Class 'Doctrine\Common\EventArgs' not found in C:\xampp\htdocs\dpbb\vendor\doctrine\dbal\src\Event\SchemaEventArgs.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\dpbb\vendor\doctrine\dbal\src\Event\SchemaEventArgs.php on line 10