Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/src/Ratchet/Session/Storage/Proxy/VirtualProxy.php:5 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/src/Ratchet/Session/Storage/Proxy/VirtualProxy.php on line 5