Fatal error: Uncaught Error: Interface "Amp\CancellationToken" not found in /home/microfrlnn/backoffice/vendor/amphp/amp/lib/CombinedCancellationToken.php:5 Stack trace: #0 {main} thrown in /home/microfrlnn/backoffice/vendor/amphp/amp/lib/CombinedCancellationToken.php on line 5