Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\FileLoader' not found in /home/soh-works/www/websoket-sample/vendor/symfony/routing/Loader/YamlFileLoader.php:30 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/routing/Loader/YamlFileLoader.php on line 30