Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\security-bundle\DependencyInjection\SecurityExtension.php:61 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\security-bundle\DependencyInjection\SecurityExtension.php on line 61