Fatal error: Uncaught Error: Interface "Ratchet\MessageComponentInterface" not found in /var/www/html/lib/Ratchet/src/Ratchet/Wamp/ServerProtocol.php:27 Stack trace: #0 {main} thrown in /var/www/html/lib/Ratchet/src/Ratchet/Wamp/ServerProtocol.php on line 27