Wikisources

Unable to process dashboard: No result from dashboard query (column: de, rule: Authors without a date of birth (P569)): SELECT (COUNT(*) AS ?count) WHERE { ?item wdt:P31 wd:Q5 . ?sitelink schema:about ?item ; schema:isPartOf <https://de.wikisource.org/> . FILTER NOT EXISTS { ?item wdt:P569 [] } }