Invalid Label error when consuming USA Today Census API

I'm trying to consume the USA Today Census API json service using jquery and jsonp. Here is the code:

var url = "http://api.usatoday.com/open/census/locations?api_key=yourapikeyhere&keyname=FIPS&sumlevid=3&keypat=36069&format=jsonp&callback=?";

        $.ajax({
            url: url,
            dataType: 'jsonp',
            type: 'GET',
            contentType: "application/json; charset=utf-8",
            success: function (result) {
                console.debug(result);
            }
        });

Here is the response if I hit the url in the browser, which is valid json:

{"request":{
        "keyname":"FIPS",
        "keypat":"36069",
        "sumlevid":"3",
        "year":"2010"},
    "response":[



    {"Placename":"Ontario","PlacenameFull":"Ontario County, N.Y.","FIPS":"36069","GNIS":"974133","StateAP":"N.Y.","StatePostal":"NY",
              "PctChange":"0.0768977",
              "Pop":"107931","PctHisp":"0.03408700","PctNonHisp":"0.96591300","PctWhite":"0.93650600","PctNonHispWhite":"0.91835500","PctBlack":"0.02253300","PctAmInd":"0.00255700","PctAsian":"0.01043300","PctNatHawOth":"0.00022200","PctTwoOrMore":"0.01666800","PctOther":"0.01108100","USATDiversityIndex":"0.16165100","PopSqMi":"167.60000000","LandSqMi":"644.10000000","WaterSqMi":"18.50000000","TotSqMi":"662.50000000","Lat":"42.8566949000","Long":"-77.3032768000","HousingUnits":"48193","PctVacant":"0.10736000"},



   "End"
   ]}

Firebug gives an "invalid label" error and doesn't return the result. Any ideas?

Solution

I updated the server, to support JSONP. (I would have done it earlier, but I just got back from vacation.)