Fatal error: Uncaught Error: Interface "League\CommonMark\Extension\ExtensionInterface" not found in D:\xampp\htdocs\lux_PHP\vendor\league\commonmark\src\Extension\Highlight\HighlightExtension.php:19 Stack trace: #0 {main} thrown in D:\xampp\htdocs\lux_PHP\vendor\league\commonmark\src\Extension\Highlight\HighlightExtension.php on line 19