Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in I:\www\oauth2\resource_server\vendor\guzzlehttp\promises\src\EachPromise.php:9 Stack trace: #0 {main} thrown in I:\www\oauth2\resource_server\vendor\guzzlehttp\promises\src\EachPromise.php on line 9