Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\promises\src\Coroutine.php:43 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\promises\src\Coroutine.php on line 43