Fatal error: Uncaught Error: Class "Doctrine\Persistence\Event\ManagerEventArgs" not found in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Event/OnFlushEventArgs.php:18 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Event/OnFlushEventArgs.php on line 18