Grouping is not working for my kendo listview

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C#3.5

Kendo

Hi,
Grouping is not working for my kendo listview. here is my code, Am i missing anything please help me!!

$(document).ready(function () {

           dataSource = new kendo.data.DataSource({

               transport: {
                   read: {
                       url: "/api/Item_container_masters",
                       dataType: "json"
                   },
                   group: { field: "Type" }
               },

               batch: true,
               pageSize: 6,
               schema: {
                   model: {
                       id: "Id",
                       fields: {
                           Id: { editable: false, nullable: true },
                           Description: "Description",
                           Type:"Type",

                       }
                   }

               }


           });