Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/DependencyInjection/SonataClassificationExtension.php:29 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/DependencyInjection/SonataClassificationExtension.php on line 29