Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/paathamus/public_html/awsSms/Aws/Multipart/AbstractUploadManager.php:21 Stack trace: #0 {main} thrown in /home/paathamus/public_html/awsSms/Aws/Multipart/AbstractUploadManager.php on line 21