Fatal error: Uncaught Error: Class "Twig_Extension" not found in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Twig/SerializerRuntimeExtension.php:8 Stack trace: #0 {main} thrown in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Twig/SerializerRuntimeExtension.php on line 8