Fatal error: Uncaught Error: Interface "Ratchet\RFC6455\Messaging\DataInterface" not found in /var/www/html/mun/vendor/ratchet/rfc6455/src/Messaging/FrameInterface.php:4 Stack trace: #0 {main} thrown in /var/www/html/mun/vendor/ratchet/rfc6455/src/Messaging/FrameInterface.php on line 4