Fatal error: Uncaught Error: Class "Doctrine\Common\EventArgs" not found in C:\Apache24\htdocs\cms_upgrade\vendor\doctrine\persistence\lib\Doctrine\Persistence\Event\LoadClassMetadataEventArgs.php:13 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\doctrine\persistence\lib\Doctrine\Persistence\Event\LoadClassMetadataEventArgs.php on line 13