Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\guzzlehttp\promises\src\FulfilledPromise.php:15 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\guzzlehttp\promises\src\FulfilledPromise.php on line 15