Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in I:\www\frameworks\Symfony\doctrine\vendor\sensio\framework-extra-bundle\src\DependencyInjection\SensioFrameworkExtraExtension.php:28 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\sensio\framework-extra-bundle\src\DependencyInjection\SensioFrameworkExtraExtension.php on line 28