Fatal error: Uncaught Error: Class "GuzzleHttp\Promise\RejectionException" not found in C:\xampp\htdocs\adminlte3\vendor\guzzlehttp\promises\src\CancellationException 2.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\guzzlehttp\promises\src\CancellationException 2.php on line 8