Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in C:\xampp\htdocs\admin\vendor\guzzlehttp\promises\src\CancellationException.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\guzzlehttp\promises\src\CancellationException.php on line 8