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Hi,

This seems like an error on the KnowRob side. I execute it on my machine and it works fine. I'm using the master branch of KnowRob (on 14.04), the latest commit I have is from 3rd of September. And I'm using the latest version of cram_json_prolog, master branch, last commit was on 26 June. Try prolog-simple or a simpler query in general.

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