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