Fatal error: Uncaught Error: Class "humhub\modules\content\widgets\richtext\AbstractRichTextConverter" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/widgets/richtext/ProsemirrorRichTextConverter.php:16 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/widgets/richtext/ProsemirrorRichTextConverter.php on line 16