Fatal error: Uncaught Error: Interface "JMS\Serializer\Handler\SubscribingHandlerInterface" not found in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Handler/StdClassHandler.php:13 Stack trace: #0 {main} thrown in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Handler/StdClassHandler.php on line 13