TypeError: f is undefined

Hi, I am having an issue with a javascript error on my datatables project. In IE9, Firefox and Chrome, I am getting the following error: TypeError: f is undefined

After searching the forums, it seems to be an issue with sorting and sType.

Here is a jsfiddle of my code:

http://jsfiddle.net/0ya4bdo4/1/

All json data is parsing correctly as the response in browser console shows this. It isnt loading though because of the error.

I believe I need to add the sType to the columns here somewhere? Thanks.

$(document).ready(function () {
    $('#auditable').DataTable({
        "ajax": "js/audi.json",
        "columns": [

            {
                "class": 'details-control',
                "orderable": false,
                "data": null,
                "defaultContent": '',

            },

            { "data": "Model" },
            { "data": "Repayments" },
            { "data": "Term" },
            { "data": "CapID" },

        ],
        "order": [[1, 'asc']]
    });