Fatal error: Uncaught Error: Class 'Doctrine\Common\EventManager' not found in D:\workspaces\liZiPingBack\vendor\symfony\doctrine-bridge\ContainerAwareEventManager.php:23 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\doctrine-bridge\ContainerAwareEventManager.php on line 23