Error : SyntaxError: Unexpected end of JSON input at Object.parse (native)

I am trying to do a create on a Kendo Grid to a C# WebAPI and I get a error

errorThrown: SyntaxError: Unexpected end of JSON input at Object.parse (native) at n.parseJSON

There is nothing in the query string and the object is coming back null

$(document).ready(function () {


        $("#btnInsert").on("click", function () {
            $("#btnInsert").on("click", function () {
                var grid = $('#SupplierGrid').data('kendoGrid');
                grid.addRow();
            });

        });


        $("#SupplierGrid").kendoGrid({
            height: 700,
            resizeable: true,
            sortable: true,
            pageable: true,
            columns: [
                { field: "supplierNumber", title: "Product ID", width: 13 },                       // Product ID
                { field: "supplierDesc", title: "Product Pack", width: 14 },                   // Product Pack
                { field: "corpei", title: "Processing Fee", width: 15 }],              // Processing Fee
            filterable: true,
            dataSource: {
                transport: {
                    read: {
                        url: "/Supplier/GetSuppliers",
                        cache: false,
                        datatype: "json"
                    },
                    update: {




                        url: "/Supplier/Updatesupplier",
                        dataType: "json",
                    },
                    create: {
                        url: "/Supplier/CreateSupplier",
                        dataType: "json",
                        type: "POST"
                    },
                    parameterMap: function (options, operation) {
                        if (operation !== "read" && operation !== "create" && options) {
                            return { models: kendo.stringify(options) };
                        }
                    }
                },
                change: function (e) {
                    if (e.action == "itemchange") {
                        this.sync();
                    }                
                },
                schema: {
                    data: "Data",
                    total: "Total",
                    model: {
                        id: "supplierNumber",
                        fields: {
                            supplierNumber: { type: "string", editable: true },
                            supplierDesc: { type: "string", editable: true },
                            corpei: { type: "string", editable: true },
                            isActive: { type: "string", editable: false }
                        }
                    }
                },
                pageSize: 15,
                requestEnd: function (e) {
                    var response = e.response;
                    var type = e.type;
                    if (type == window.undefined) {
                        //   showError();

                        var popupNotification = $("#popupNotification").kendoNotification(
                      {
                          position: {
                              top: $(document).height() / 2 + 300,
                              right: $(document).width() / 2
                          },
                          allowHideAfter: 500,
                          stacking: "down"

                      }
                  ).data("kendoNotification");
                        var staticNotification = $("#staticNotification").kendoNotification({
                            appendTo: "#appendto"
                        }).data("kendoNotification");
                        popupNotification.show("Save Failed", "error");
                    }
                    else {
                        if (type == 'update') {
                            var popupNotification = $("#popupNotification").kendoNotification(
                                 {
                                     position: {
                                         top: $(document).height() / 2 + 300,
                                         right: $(document).width() / 2
                                     },
                                     allowHideAfter: 500,
                                     stacking: "down"

                                 }
                             ).data("kendoNotification");
                            var staticNotification = $("#staticNotification").kendoNotification({
                                appendTo: "#appendto"
                            }).data("kendoNotification");
                            popupNotification.show("Cell Saved", "success");
                        }
                    }
                }
            },
            scrollable: true,
            Batch: true,
            navigatable: true,
            editable: { //disables the deletion functionality
                update: true,
                destroy: false
            },
            serverPaging: true,
            resizeable: true,
            serverSorting: true
        });

        $('#SupplierGrid').data('kendoGrid').dataSource.bind("error", dataSource_error);
    });

    function dataSource_error(e) {

    }



     [HttpPost]
        public JsonResult CreateSupplier(supplier s)
        {
            supplier model = null;

}