Filter on Grid Getting toLowerCase error

[Anis]

Hi -
  I have my grid set up below when i try to filter a column i get to lowercase undefined error but without the row template the filtering works.  But i need to do row templating because i wanted some ajax buttons in my grid columns

   $(document).ready(function () {
        $("#grid").kendoGrid({
            dataSource: {
                dataType: "json",
                transport: {
                    read: "@HttpContext.Current.Request.Url/GetUsers"
                },
                schema: {
                    data: "Users",
                    total: "Count",
                    model:
                        {
                            fields:
                            {
                            UserLastName: {field: "UserLastName", type: "string" },
                            UserFirstName: { type: "string" },
                            UserInstitutionName: { type: "string" }
                            }
                       }
                    },
                serverPaging: false,
                serverSorting: false,
                serverFiltering: false,
                pageSize: 25
            },
            rowTemplate: kendo.template($("#rowTemplate").html()),
            sortable: true,
            pageable: true,
            filterable: true,
            scrollable: false
        });

[Anis]

Do i need to get an updated version or something