Fatal error: Uncaught Error: Interface "League\CommonMark\Extension\FrontMatter\FrontMatterParserInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/league/commonmark/src/Extension/FrontMatter/FrontMatterParser.php:21 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/league/commonmark/src/Extension/FrontMatter/FrontMatterParser.php on line 21