Fatal error: Uncaught Error: Interface "Ratchet\ConnectionInterface" not found in C:\xampp\htdocs\hannoole\schol\vendor\cboden\ratchet\src\Ratchet\Server\IoConnection.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hannoole\schol\vendor\cboden\ratchet\src\Ratchet\Server\IoConnection.php on line 9