Fatal error: Uncaught Error: Interface 'Tree\Visitor\Visitor' not found in /var/www/html/wiki_2023/extensions/SemanticResultFormats/formats/tree/TreeNodeVisitor.php:9 Stack trace: #0 {main} thrown in /var/www/html/wiki_2023/extensions/SemanticResultFormats/formats/tree/TreeNodeVisitor.php on line 9