Fatal error: Uncaught Error: Interface 'Ratchet\MessageInterface' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/src/Ratchet/Http/HttpRequestParser.php:12 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/src/Ratchet/Http/HttpRequestParser.php on line 12