Fatal error: Uncaught Error: Class 'Doctrine\Persistence\Event\ManagerEventArgs' not found in D:\workspaces\liZiPingBack\vendor\doctrine\orm\lib\Doctrine\ORM\Event\OnClassMetadataNotFoundEventArgs.php:20 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\doctrine\orm\lib\Doctrine\ORM\Event\OnClassMetadataNotFoundEventArgs.php on line 20