Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\RequestMatcher' not found in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/ExpressionRequestMatcher.php:21 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/http-foundation/ExpressionRequestMatcher.php on line 21