Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\guzzle\src\Pool.php:20 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\guzzlehttp\guzzle\src\Pool.php on line 20