Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\Loader' not found in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/routing/Loader/ClosureLoader.php:24 Stack trace: #0 {main} thrown in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/routing/Loader/ClosureLoader.php on line 24