如下WPF xaml文件。
error MC3050: Cannot find the type 'self:User'.
帮忙看看哪里不对？

<Window x:Class="WpfTutorialSamples.Rich_text_controls.BlockUIContainerSample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:self="clr-namespace:WpfTutorialSamples.Rich_text_controls"
Title="BlockUIContainerSample" Height="275" Width="300">
<Window.Resources>
<x:Array x:Key="UserArray" Type="{x:Type self:User}">
<self:User Name="John Doe" Age="42"/>
<self:User Name="Jane Doe" Age="36"/>
</x:Array>
</Window.Resources>
<Grid>
<FlowDocumentScrollViewer>
<FlowDocument>
<Paragraph FontSize="36" Margin="0">Users</Paragraph>
<Paragraph FontStyle="Italic" TextAlignment="Left" FontSize="14" Foreground="Gray">Here's a list of our users, inside our FlowDocument, in a completely interactive ListView control!</Paragraph>
<BlockUIContainer>
<ListView BorderThickness="0" ItemsSource="{StaticResource UserArray}">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="150" />
<GridViewColumn Header="Age" DisplayMemberBinding="{Binding Age}" Width="75" />
</GridView>
</ListView.View>
</ListView>
</BlockUIContainer>
<Paragraph FontStyle="Italic" TextAlignment="Left" FontSize="14" Foreground="Gray">More content can go here...</Paragraph>
</FlowDocument>
</FlowDocumentScrollViewer>
</Grid>
</Window>