Fatal error: Uncaught Error: Class "JMS\Serializer\Exception\RuntimeException" not found in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Exception/ValidationFailedException.php:7 Stack trace: #0 {main} thrown in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Exception/ValidationFailedException.php on line 7