Fatal error: Uncaught Error: Trait "Ratchet\Http\CloseResponseTrait" not found in /var/www/html/websocket/vendor/cboden/ratchet/src/Ratchet/Http/HttpServer.php:6 Stack trace: #0 {main} thrown in /var/www/html/websocket/vendor/cboden/ratchet/src/Ratchet/Http/HttpServer.php on line 6