Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /home/palabrebel/www/kimai/vendor/jms/serializer-bundle/DependencyInjection/JMSSerializerExtension.php:29 Stack trace: #0 {main} thrown in /home/palabrebel/www/kimai/vendor/jms/serializer-bundle/DependencyInjection/JMSSerializerExtension.php on line 29