Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in C:\xampp\htdocs\app\Http\RequestHandlers\PendingChangesAcceptTree.php:36 Stack trace: #0 {main} thrown in C:\xampp\htdocs\app\Http\RequestHandlers\PendingChangesAcceptTree.php on line 36