Fatal error: Uncaught Error: Interface 'Ratchet\MessageComponentInterface' not found in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/helpers/Ratchet/NullComponent.php:8 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/cboden/ratchet/tests/helpers/Ratchet/NullComponent.php on line 8