I am attempting to create my first UserControl and I am getting an error when I view my page in the browser.  The error I get is "ag_e_parser_bad_property_value"

 When I use the UserControl.xaml outside of a user control, it works fine, but when I try to put my user control into my test page and test xaml, I get the error.  Here are the two XAML files I am using and I am curious if you guys could spot what I am doing wrong.

 UserControl.xaml:
<Canvas
        xmlns="http://schemas.microsoft.com/client/2007"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Name="parentCanvas"
        Width="400"
        Height="40"
        Background="Yellow"
        >
  <Canvas.Resources>
    <Storyboard x:Name="marqueeStoryBoard">
      <DoubleAnimation x:Name="marqueeAnimation" By="1" From="0" Duration="00:00:10" RepeatBehavior="Forever" Storyboard.TargetName="marqueeTextBlock" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)" />
    </Storyboard>
  </Canvas.Resources>
  <TextBlock x:Name="marqueeTextBlock" Height="40" Width="400" RenderTransformOrigin="0.5,0.5" FontSize="20" FontWeight="Bold" Text="This is some sample text" >
    <TextBlock.RenderTransform>
      <TransformGroup>
        <TranslateTransform X="0" Y="0"/>
      </TransformGroup>
    </TextBlock.RenderTransform>
  </TextBlock>
</Canvas>

And here is my test XAML when I am trying to use the user control:
<Canvas x:Name="parentCanvas"
        xmlns="http://schemas.microsoft.com/client/2007"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Loaded="Page_Loaded"
        x:Class="Marquee.UserControl;assembly=ClientBin/Marquee.dll"
        Width="640"
        Height="480"
        Background="Gray"
        xmlns:MarqueeUserControl="clr-namespace:Whoiskb;assembly=ClientBin/UserControl.dll"
        >
  <MarqueeUserControl:Marquee x:Name="marquee1"
                              Text="This is some sample test to see if the namespace works"
                              Canvas.Top="100" Canvas.Left="20" />
</Canvas>