Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/qld/public_html/tube1/Update Guide/v3.1/assets/libs/payfastSDK/vendor/guzzlehttp/guzzle/src/Pool.php:24 Stack trace: #0 {main} thrown in /home/qld/public_html/tube1/Update Guide/v3.1/assets/libs/payfastSDK/vendor/guzzlehttp/guzzle/src/Pool.php on line 24