Fatal error: Uncaught Error: Interface 'Ratchet\WebSocket\WsServerInterface' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/helpers/Ratchet/Wamp/Stub/WsWampServerInterface.php:6 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/helpers/Ratchet/Wamp/Stub/WsWampServerInterface.php on line 6