[Solved] Exception Code: 4004 System.Windows.Markup.XamlParseException

[Jeff Watson]

SERVER SIDE:
Java WebService running on Glassfish
Service returns a List     List<host>

CLIENT SIDE:
.net 3.5 Silverlight Application

PROBLEM:
Data is returned from service and bound to items source of data grid.  Listing and sorting works.  Clicking the filter icon in the column header fails.  Help?  I feel like I'm missing something obvious.

Unhandled Error in Silverlight Application
Code: 4004
Category: ManagedRuntimeError
Message: System.Windows.Markup.XamlParseException: AG_E_PARSER_BAD_TYPE [Line: 0 Position: 0]

public partial class ServiceDetail : UserControl
    {
        MonitoringServiceClient _monitoringSvc = new MonitoringServiceClient();

        public ServiceDetail()
        {
            InitializeComponent();

            // Events
            this.Loaded += new RoutedEventHandler(ServiceDetail_Loaded);
        }

        void ServiceDetail_Loaded(object sender, RoutedEventArgs e)
        {
            this._monitoringSvc.GetStatusAsync();
            this._monitoringSvc.GetStatusCompleted += new EventHandler<GetStatusCompletedEventArgs>(_monitoringSvc_GetStatusCompleted);
        }

        void _monitoringSvc_GetStatusCompleted(object sender, GetStatusCompletedEventArgs e)
        {
            // The monitoring service returns a List of host objects List<host>
            // This binds and items are listed and sortable by clicking columns, but
            // clicking the filter icon in the column header throws exception.
            this.itemsGrid.ItemsSource = e.Result;
        }
    }

<Grid x:Name="LayoutRoot" Background="White">
        <StackPanel>
            <grid:RadGridView x:Name="itemsGrid" AutoGenerateColumns="False" IsReadOnly="True" ColumnsWidthMode="Fill" CanUserFreezeColumns="True">
                <grid:RadGridView.Columns>
                    <grid:GridViewDataColumn Header="Host" UniqueName="hostName"/>
                    <grid:GridViewDataColumn Header="Host" UniqueName="hasBeenChecked"/>
                    <grid:GridViewDataColumn Header="Host" UniqueName="currentState"/>
                </grid:RadGridView.Columns>
            </grid:RadGridView>
        </StackPanel>
    </Grid>

[Rossen Hristov]

Hi Jeff Watson,

We will need a runnable dummy project that reproduces this error so we can debug it and identify what is causing it. You can create a small sample project in which you bind the grid to a List<host> of dummy data (not from the service) just for the sake of reproducing the exception.

Unfortunately, we have no way to infer what is going on from the AG_E_PARSER_BAD_TYPE message only, since this is the message for almost any exception in Silverlight. That is why we really need a project we can debug, since we would really like to help you.

We are looking forward to hearing from you.

All the best,
Ross
the Telerik team

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[Jeff Watson]

Thanks Ross,

I submitted a support ticket and referenced this post.  This was the only way I knew to attach a .zip with the solution.

Regards,

Jeff

[Jeff Watson]

Telerik support resolved my issue and provided the latest assemblies which should be referenced in my project.  Having the latest assemblies is important!  LESSON LEARNED: Always double check your assemblies if you encounter an error.  Chances are these guys have already fixed it.