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