Fatal error: Uncaught Error: Class "JMS\Serializer\Annotation\XmlCollection" not found in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Annotation/XmlList.php:9 Stack trace: #0 {main} thrown in /home/kiwakim/stock/vendor/jms/serializer/src/JMS/Serializer/Annotation/XmlList.php on line 9