Fatal error: Uncaught Error: Interface "Ratchet\Http\HttpServerInterface" not found in C:\xampp\htdocs\hannoole\schol\vendor\cboden\ratchet\src\Ratchet\Session\SessionProvider.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hannoole\schol\vendor\cboden\ratchet\src\Ratchet\Session\SessionProvider.php on line 17