Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in D:\xampp\htdocs\New folder\pengadaan-barang\vendor\guzzlehttp\promises\src\AggregateException.php:8 Stack trace: #0 {main} thrown in D:\xampp\htdocs\New folder\pengadaan-barang\vendor\guzzlehttp\promises\src\AggregateException.php on line 8