The invocation of the constructor on type 'WpfApplication1.MainWindow' that matches the specified binding constraints threw an exception

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C#

WPF

C#4.0

DataGrid

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit"
         xmlns:core="clr-namespace:System;assembly=mscorlib" 
        xmlns:local="clr-namespace:WpfApplication1"
         xmlns:my="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" 
        xmlns:localprimitives="clr-namespace:Microsoft.Windows.Controls.Primitives;assembly=WPFToolkit"    
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <ObjectDataProvider x:Key="RecordValues" MethodName="GetValues"
                            ObjectType="{x:Type core:Enum}">
            <ObjectDataProvider.MethodParameters>
                <x:Type Type="local:RecordValues" />
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </Window.Resources>
    <Grid>
        <dg:DataGrid AutoGenerateColumns="False" ItemsSource="{Binding}"
                  Margin="10" Name="dataGrid1">
            <dg:DataGrid.Columns>
                <dg:DataGridComboBoxColumn Header="Combo" Width="300"
                     SelectedItemBinding="{Binding Value}" 
                     ItemsSource="{Binding Source={StaticResource RecordValues}}" />



            </dg:DataGrid.Columns>
        </dg:DataGrid>
    </Grid>

</Window>

this is the error while debugging the above code:"The invocation of the constructor on type 'WpfApplication1.MainWindow' that matches the specified binding constraints threw an exception.' Line number '8' and line position '9'."

since the beginning of the project I am using xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit" . so I can't remove this namespace and opt for DataGrid instead of dg:DataGrid. I know that the problem relies on the usage of the abobe namespace. anybody can help to resolve the issues at the same time retaining dg:

thanks in advance

Iqbal