Fatal error: Uncaught Error: Interface 'Stringable' not found in C:\xampp\htdocs\api-login\vendor\league\commonmark\src\Output\RenderedContentInterface.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\api-login\vendor\league\commonmark\src\Output\RenderedContentInterface.php on line 18