Fatal error: Uncaught Error: Class "cebe\markdown\GithubMarkdown" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php:34 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php on line 34