Fatal error: Uncaught Error: Interface 'Ratchet\WebSocket\WsServerInterface' not found in /var/www/html/stz-api/vendor/cboden/ratchet/src/Ratchet/Wamp/TopicManager.php:6 Stack trace: #0 {main} thrown in /var/www/html/stz-api/vendor/cboden/ratchet/src/Ratchet/Wamp/TopicManager.php on line 6