I don't think many people would quite understand stuff like "serialization" and "configured id builders".
also the error is not differentiated, style-wise, from the other stuff on the special page. I think we have ways in a special page to format an error.
The serialization "Italy" is not recognized by the configured id builders
This special page generates a content page about a certain topic with Wikidata information
Enter an entity id to get an auto-generated article placeholder.
e.g. https://test.wikipedia.org/wiki/Special:AboutTopic/Italy