Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in C:\xampp\htdocs\kotsch.tech\kotsch-tech - Kopie (2)\vendor\guzzlehttp\promises\src\Promise.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kotsch.tech\kotsch-tech - Kopie (2)\vendor\guzzlehttp\promises\src\Promise.php on line 14