Fatal error: Uncaught Error: Interface 'GuzzleHttp\ClientInterface' not found in D:\xampp\htdocs\psp\backend\vendor\guzzlehttp\guzzle\src\Client.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\guzzlehttp\guzzle\src\Client.php on line 17