[Solved] Problem with treeView MVC extention

[Shaza]

I'm working with a treeView data Binding in MVC, and I'm getting the following error, on mappings:

Error   1   Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type


When I try to run the demo code:

<% Html.Telerik().TreeView()


 .Name("TeleTreeView")
    .BindTo(Model, mappings =>
    {
         mappings.For<Category>(binding => binding
        .ItemDataBound((item, category) =>
        {
            item.Text = category.CategoryName;
        })
        .Children(category => category.Products));
         mappings.For<Product>(binding => binding
        .ItemDataBound((item, product) =>
        {
            item.Text = product.ProductName;
       }));
})
   .Render(); %>

I've read that maybe I'm missing an assembly so I've added the Linq one:

<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

Still having the same problem, any suggestions?