Hi Mediawiki-api mailing listers!

I'm trying to extract the full list of references for different revisions of Wikipedia pages. This seemed like it would be easy enough with "prop=references", but I keep getting the following error:

"error": {
        "code": "citestoragedisabled",
        "info": "Cite extension reference storage is not enabled.",
        "*": "See https://en.wikipedia.org/w/api.php for API usage."
    }

Even the example on the API's documentation page returns this error (https://en.wikipedia.org/w/api.php?action=help&modules=query%2Breferences). 

Why does this occur? And is there no way of getting references through the API?