Most of the examples on this page are broken.
Semantic_Maps_examples/Query_by_category for example yields this.
Stefan Seidner-Britting (talk)
The error you mentioned related to QueryData was me breaking the master which has already been fixed [1] but is not yet deployed on smw.org.
[1] https://gerrit.wikimedia.org/r/#/c/57064/
James Hong Kong (talk)
