Index Out Of Range Exception in GridBuilder

[Yasser Moradi]

Hi ,
I've developed a few lines of code with ASP.NET MVC wrappers of Telerik
A Customer Entity with ID , Name , Rate
Entity Framework Code First Context
A Controller with this code : 

public ActionResult Index()

        {

            return View();

        }

 

        public ActionResult Customers([DataSourceRequest] DataSourceRequest request)

        {

            var customers = Context.Customers.ToDataSourceResult(request);

            return Json(customers);

        }

and a view with this code

@(Html.Kendo().Grid<Customer>()

    .Name("CustomersGrid")

    .Columns(columns =>

    {

        columns.Bound(c => c.ID).Groupable(false);

        columns.Bound(c => c.FName);

        columns.Bound(c => c.LName);

        columns.Bound(c => c.Rate);

    })

        .Groupable()

        .Pageable()

        .Sortable()

        .Scrollable()

        .Filterable()

        .DataSource(dataSource => dataSource.Ajax().Read(read => read.Action("Customers", "Customer"))

    )

)

when render of view finishes at the end of @HTML.Kendo
I give this exception

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Line 19:         .Scrollable()
Line 20:         .Filterable()
Line 21:         .DataSource(dataSource => dataSource.Ajax().Read(read => read.Action("Customers", "Customer"))
Line 22:     )
Line 23: )

[ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index]
   System.ThrowHelper.ThrowArgumentOutOfRangeException() +72
   System.Collections.ObjectModel.Collection`1.set_Item(Int32 index, T value) [phone]
   System.Web.Mvc.ControllerContext.get_RequestContext() +25
   Kendo.Mvc.UI.NavigatableExtensions.GenerateUrl(INavigatable navigatable, ViewContext viewContext, IUrlGenerator urlGenerator) +52
   Kendo.Mvc.UI.Fluent.CrudOperationBuilder.SetUrl() +81
   Kendo.Mvc.UI.Fluent.CrudOperationBuilder.Action(String actionName, String controllerName, Object routeValues) +66
   Kendo.Mvc.UI.Fluent.CrudOperationBuilder.Action(String actionName, String controllerName) +47
   ASP._Page_Views_Customer_Index_cshtml.<Execute>b__1(CrudOperationBuilder read) in c:\Users\a.rezaei\Desktop\MVCWebApp\MVCWebApp\Views\Customer\Index.cshtml:21
   Kendo.Mvc.UI.Fluent.AjaxDataSourceBuilderBase`2.Read(Action`1 configurator) +131
   ASP._Page_Views_Customer_Index_cshtml.<Execute>b__0(DataSourceBuilder`1 dataSource) in c:\Users\a.rezaei\Desktop\MVCWebApp\MVCWebApp\Views\Customer\Index.cshtml:21
   Kendo.Mvc.UI.Fluent.GridBuilder`1.DataSource(Action`1 configurator) +212
   ASP._Page_Views_Customer_Index_cshtml.Execute() in c:\Users\a.rezaei\Desktop\MVCWebApp\MVCWebApp\Views\Customer\Index.cshtml:7

Extra Info

Windows : 8 , Visual Studio Development Server , Visual Studio 2012 , .NET 4.5 , MVC 4 , Kendo UI MVC Wrappers v2012.2.710
 
thanks for your support

[Yasser Moradi]

Downgrading to ASP.NET 3 would be handy