Fatal error: Uncaught Error: Class "Microsoft\Kiota\Http\Middleware\RetryHandler" not found in C:\xampp\htdocs\londoncityroom\vendor\microsoft\microsoft-graph-core\src\Middleware\GraphRetryHandler.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\londoncityroom\vendor\microsoft\microsoft-graph-core\src\Middleware\GraphRetryHandler.php on line 24