Hey,
We have had a createclaim API module for a while now, and although we have not deployed it on wikidata.org, some of you might have played around with it on local installs. Yesterday changes where merged vastly improving how claims are stored. The current code no longer supports the old format and you might get errors when trying to load entities that have claims in the old format attached. If this causes any problems, you can delete these entities.
Cheers
-- Jeroen De Dauw http://www.bn2vs.com Don't panic. Don't be evil. --