Fatal error: Uncaught Error: Interface 'GuzzleHttp\Promise\PromiseInterface' not found in /Applications/XAMPP/xamppfiles/htdocs/Project_April/GuzzleHttp/Promise/Promise.php:9 Stack trace: #0 {main} thrown in /Applications/XAMPP/xamppfiles/htdocs/Project_April/GuzzleHttp/Promise/Promise.php on line 9