Table > asmx webservice parameter '0' for row 0, column 0

hf1

http://live.datatables.net/nenuyude/1

http://debug.datatables.net/omalor

Hi, I'm trying to fill a table with data from a asmx webservice. Every time I get the warning: DataTables warning: table id=tblData - Requested unknown parameter '0' for row 0, column 0. For more information about this error, please see http://datatables.net/tn/4

Via debugger I can see the aaData is filled with the correct data.

var table = $('#tblData').DataTable({
    bProcessing: true,
    bServerSide: true,
    sAjaxSource: "getData.asmx/GetTWSLog",
    sAjaxDataProp: "aaData",
    aoColumns: [
      { Id: "Id" },
      { AgEcco: "AgEcco" }

    ],
    fnServerData: function (sSource, aoData, fnCallback) {
      $.ajax({
        dataType: 'json',
        contentType: "application/json",
        type: "GET",
        url: sSource,
        data: aoData,
        success: function (data) {

          var json = $.parseJSON(data.d);
          fnCallback(json);

          //$("#tblData").show();
        },
        error: function (xhr, textStatus, error) {
          if (typeof console == "object") {
            console.log(xhr.status + "," + xhr.responseText + "," + textStatus + "," + error);
          }
        }
      });
    }
  });