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