Fatal error: Uncaught Error: Class "JMS\Serializer\EventDispatcher\ObjectEvent" not found in /var/www/html/src/vendor/jms/serializer/src/EventDispatcher/PreSerializeEvent.php:7 Stack trace: #0 {main} thrown in /var/www/html/src/vendor/jms/serializer/src/EventDispatcher/PreSerializeEvent.php on line 7