Fatal error: Uncaught Error: Interface "JMS\Serializer\Handler\SubscribingHandlerInterface" not found in /home/safi/websites/smartelio/shopware/vendor/jms/serializer/src/Handler/UnionHandler.php:20
Stack trace:
#0 {main}
  thrown in /home/safi/websites/smartelio/shopware/vendor/jms/serializer/src/Handler/UnionHandler.php on line 20