Fatal error: Uncaught Error: Interface "JMS\Serializer\Handler\SubscribingHandlerInterface" not found in /home/activeexcavators/public_html/vendor copy/jms/serializer/src/Handler/StdClassHandler.php:15 Stack trace: #0 {main} thrown in /home/activeexcavators/public_html/vendor copy/jms/serializer/src/Handler/StdClassHandler.php on line 15