Dear Giorgio, I had a closer look at your issue and was very puzzled, until I looked at https://data.leibnitiana.eu/index.php/Special:Version and realized you are running an old version of the Wikibase extension that does not have the "SortedProperties" feature yet. You need to update your MediaWiki along with a version of the Wikibase extension that fit together.
Best Thiemo _______________________________________________ Wikidata-tech mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikidata-tech
