After upgrading my site: http://www.hattebol.no/index.php?title=Forside to 1.28.2, my template:infobox person stopped working. So I installed Wikibase Client and repository and created the seemingly missing Properties. Still I can't get rid of the display of the missing parameters in the template. See http://www.hattebol.no/index.php?title=Mal%3AInfoboks_biografi
Topic on Extension talk:Wikibase Client
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At this point Wikibase requires more up-to-date code than MediaWiki 1.28.2. Have you tried installing the latest code from git?
Lydia,
I have now tried ver. 1.29.0 and 1.30.0-alpha (from Git) with the same result.