Hey, I don't know about this particular error, though can say Wikibase is no longer compatible with MediaWiki 1.23. Unfortunately retaining compatibility with a stable MediaWiki version, and third party support in general, does not appear to be high on the priority list of the Wikidata team. So I can only recommend against third parities using the software in serious contexts for now.
Cheers -- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3
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