SCRIPT5007: Unable to get value of the property 'style': object is null or undefined

I have implement the following Datatable which is working fine on all browsers except IE7/IE8.

I get the following Error:
SCRIPT5007: Unable to get value of the property 'style': object is null or undefined
jquery.dataTables.min.js, line 78 character 277

I am very new to Datatables and looking on the web I can not see anything obvious

$(document).ready(function () {
        var rowData = [];
        var jobTable = $("#jobDataTable").dataTable({
            "sDom": '<"H"l>rt<"F"ip>',
            "bServerSide": true,
            "sAjaxSource": '@Url.Action("GetKJListHandler", "Job")',
            "bProcessing": true,
            "bJQueryUI": true,
            "bStateSave": true,
            "bPaginate": true,
            "bSort": true,
            "rowHeight": "auto",
            "sPaginationType": "full_numbers",
            "aoColumns": [
                {
                    "mDataProp": null,
                    "sDefaultContent": "",
                    "bSortable": false,
                    "sWidth": "30px",
                    "fnRender": function (obj) {
                        return "<span id=sparkline" + obj.aData.ChartID + "></span>";
                    }
                },
                {
                    "mDataProp": "ID",
                    "fnRender": function (oObj) {
                        var jobUrl = '@Url.Action("View", "Job")';
                        var jobID = oObj.aData[oObj.oSettings.aoColumns[oObj.iDataColumn].mDataProp];

                        return "<a href='" + jobUrl + "/" + jobID + "'>KJ" + jobID + "</a>";
                    }
                },
                {
                    "mDataProp": "Name",
                    "sWidth": "40%"
                },
                {
                    "mDataProp": "Status",
                    "bSortable": false
                },
                {
                    "mDataProp": "TotalSubJobs",
                    "sClass": "textalign-center"
                },
                {
                    "mDataProp": "Client",
                    "sWidth": "20%"
                },
                {
                    "mDataProp": "PlannedFTPDate",
                    "fnRender": function (obj, val) {
                        return FormatJSONDate(val);
                    }
                },
                {
                    "mDataProp": "StartedDate",
                    "bSortable": false,
                    "fnRender": function (obj, val) {
                        return FormatJSONDate(val);
                    }
                },
            ],
            "fnPreDrawCallback": function (oSettings) {
                rowData = [];
            },
            "fnRowCallback": function (nRow, aData, iDisplayIndex, iDisplayIndexFull) {
                rowData.push(aData);
            },
            "fnDrawCallback": function (oSettings) {
                for (var i = 0; i < rowData.length; i++) {
                    jobTable.$("#sparkline" + rowData[i].ChartID).sparkline([
                        rowData[i].PendingSubJobs,
                        rowData[i].SubJobsOnTime,
                        rowData[i].LateStageSubJobs,
                        rowData[i].SubJobsOnHoldOrErrored,
                        rowData[i].CompletedSubJobs],
                        {
                            type: "pie",
                            height: 30,
                            borderWidth: 2,
                            borderColor: "#E1E1E1",
                            sliceColors: ["#EBEBEB", "#07D507", "#F93B3B", "#C143C1", "#9C9C9C", "#1972EF"],
                            tooltipFormat: "<span style='color: {{color}}'>&#9679;</span> {{value}} {{offset:names}} {{percent.1}}%",
                            tooltipValueLookups: {
                                names: {
                                    0: "Pending Sub Jobs",
                                    1: "SubJobs On Time",
                                    2: "Late Sub Jobs",
                                    3: "Sub Jobs On Hold/Errored",
                                    4: "Completed Sub Jobs",
                                    5: "Voided Sub Jobs"
                                }
                            }
                        });
                }
            }
        });

        $("thead input").keyup(function () {
            jobTable.fnFilter(this.value, $("thead input").index(this));
        });
    });