Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension' not found in /home/itscm/dev.its.cm/webserivesits/vendor/jms/serializer-bundle/DependencyInjection/JMSSerializerExtension.php:19 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/vendor/jms/serializer-bundle/DependencyInjection/JMSSerializerExtension.php on line 19