Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/benjamincb/demos/acdg-site/vendor/nelmio/security-bundle/DependencyInjection/NelmioSecurityExtension.php:24 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/nelmio/security-bundle/DependencyInjection/NelmioSecurityExtension.php on line 24