Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Extension\Extension' not found in C:\Apache24\htdocs\cwbts\vendor\babdev\pagerfanta-bundle\DependencyInjection\BabDevPagerfantaExtension.php:17 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwbts\vendor\babdev\pagerfanta-bundle\DependencyInjection\BabDevPagerfantaExtension.php on line 17