Hi,

I'm working on a MVC project with iggrid. My model has a list of items and I'm binding the table with items. All works well, accept when I'm trying to ungroup a column after grouping it.

 $(function () {
        $("#tblInvoices").igGrid({
            autoGenerateColumns: false,
            fixedHeader: false,
            columns: [
                { headerText: "Invoice #", key: "InvoiceID", dataType: "number", width: 100 },
                { headerText: "Invoice Category", key: "InvoiceCategory", dataType: "string" },
                { headerText: "Invoice Status", key: "InvoiceStatus", dataType: "string" },
                { headerText: "Contractor", key: "ContractorName", dataType: "string" },
                { headerText: "Project", key: "ProjectName", dataType: "string" },
                { headerText: "Invoice Date", key: "InvoiceDate", dataType: "Date" },
                { headerText: "Due Date", key: "DueDate", dataType: "Date" },
                { headerText: "Total", key: "InvoiceTotal", dataType: "decimal" },
                { headerText: "Payment Status", key: "PaymentStatus", dataType: "string" },
                { headerText: "Actions", key: "Actions", dataType: "string", width: 80 },
            ],
            primaryKey: "InvoiceID",
            height: '800px',
            features: [
                {
                    name: "Selection",
                    mode: "row",
                    multipleSelection: true,
                    activation: true
                },
                {
                    name: "Paging",
                    pageSize: 20
                },
                {
                    name: "GroupBy",
                    type: "local"
                    /*persist: true*/
                },
                {
                    name: "Sorting",
                    type: "local",
                    caseSensitive: true,
                    columnSettings: [
                        { columnKey: "ContractorName", allowSorting: true },
                        { columnKey: "DueDate", allowSorting: true, isGroupBy: true, dir: "asc" }
                    ]
                },
                {
                    name: 'Resizing',
                    columnSettings: [
                        { columnKey: "ContractorName", allowResizing: true }
                    ]
                }

            ]
        });
    });

Here's error that is being thrown:

How do I resolve this?

Thanks in advance for your help.