Hi @Guglielmo_Francesconi Please make sure the below config node has the below property. com.day.cq.rewriter.linkchecker.impl.LinkCheckerTransformerFactory.xml <?xml version="1.0" encoding="UTF-8"?><jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" ...