Fatal error: Uncaught Error: Class "Doctrine\Persistence\Event\ManagerEventArgs" not found in /home/technoon/public_html/askon/vendor/doctrine/orm/lib/Doctrine/ORM/Event/OnClassMetadataNotFoundEventArgs.php:20 Stack trace: #0 {main} thrown in /home/technoon/public_html/askon/vendor/doctrine/orm/lib/Doctrine/ORM/Event/OnClassMetadataNotFoundEventArgs.php on line 20