Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\promises\src\FulfilledPromise.php:10 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\promises\src\FulfilledPromise.php on line 10