Fatal error: Uncaught Error: Class 'Doctrine\Common\EventArgs' not found in D:\workspaces\liZiPingBack\vendor\doctrine\orm\lib\Doctrine\ORM\Event\PreFlushEventArgs.php:15 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\doctrine\orm\lib\Doctrine\ORM\Event\PreFlushEventArgs.php on line 15