Fatal error: Uncaught Error: Interface 'GuzzleHttp\MessageFormatterInterface' not found in D:\xampp\htdocs\psp\backend\vendor\guzzlehttp\guzzle\src\MessageFormatter.php:38 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\guzzlehttp\guzzle\src\MessageFormatter.php on line 38