Fatal error: Uncaught Error: Interface "Ratchet\RFC6455\Messaging\DataInterface" not found in /home/itcarrot/public_html/funk-uberdachung-muc.de/vendor/ratchet/rfc6455/src/Messaging/MessageInterface.php:4 Stack trace: #0 {main} thrown in /home/itcarrot/public_html/funk-uberdachung-muc.de/vendor/ratchet/rfc6455/src/Messaging/MessageInterface.php on line 4