Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\http-foundation\Exception\ConflictingHeadersException.php:19 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\http-foundation\Exception\ConflictingHeadersException.php on line 19