Fatal error: Uncaught Error: Interface "Amp\CancellationToken" not found in C:\xampp\htdocs\epingame\vendor\amphp\amp\lib\CombinedCancellationToken.php:5 Stack trace: #0 {main} thrown in C:\xampp\htdocs\epingame\vendor\amphp\amp\lib\CombinedCancellationToken.php on line 5