Fatal error: Uncaught Error: Class 'JMS\Serializer\Exception\RuntimeException' not found in /home/lafaamicps/www/symfony/vendor/jms/serializer/src/JMS/Serializer/Exception/XmlErrorException.php:21 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/jms/serializer/src/JMS/Serializer/Exception/XmlErrorException.php on line 21