Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in C:\Apache24\htdocs\vendor.old\guzzlehttp\promises\src\CancellationException.php:10 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\vendor.old\guzzlehttp\promises\src\CancellationException.php on line 10