XAML Error

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HI All - I was creating a silverlight sketchflow app and suddenly it would not longer build.  It gets to the following line and states "The speciified value cannot be assigned to the collection.  The following type was expected:  "UIElement".  (It breaks on the "Grid" tag at the very bottom) 

<UserControl
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
 xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:pi="http://schemas.microsoft.com/prototyping/2010/interactivity"
 mc:Ignorable="d"
 x:Class="WorkOrderTool_SilScreens.Screen_1"
 Width="800" Height="600">
 <UserControl.Resources>
  <ResourceDictionary>
   <ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="ProjectDataSources.xaml"/>
   </ResourceDictionary.MergedDictionaries>
   <DataTemplate x:Key="ItemTemplate">
    <StackPanel>
     <TextBlock Text="{Binding KeyPartID}" Style="{StaticResource BasicTextBlock-Sketch}"/>
    </StackPanel>
   </DataTemplate>
   <DataTemplate x:Key="ItemTemplate1">
    <StackPanel>
     <TextBlock Text="{Binding PKPN}" Style="{StaticResource BasicTextBlock-Sketch}"/>
    </StackPanel>
   </DataTemplate>
   <DataTemplate x:Key="ItemTemplate2">
    <StackPanel>
     <TextBlock Text="{Binding PKPN}" Style="{StaticResource BasicTextBlock-Sketch}"/>
    </StackPanel>
   </DataTemplate>
   <DataTemplate x:Key="ItemTemplate3">
    <StackPanel>
     <TextBlock Text="{Binding PKPN}" Style="{StaticResource BasicTextBlock-Sketch}"/>
    </StackPanel>
   </DataTemplate>
  </ResourceDictionary>
 </UserControl.Resources>
 <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource PKPN_Data}}">