Fatal error: Uncaught Error: Interface 'GuzzleHttp\Promise\PromiseInterface' not found in /home/wittyly/public_html/staging/wittymanager-api/vendor/guzzlehttp/promises/src/FulfilledPromise.php:11 Stack trace: #0 {main} thrown in /home/wittyly/public_html/staging/wittymanager-api/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 11