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