HierarchicalDataTemplate not finding correct public Type

For some reason I can't get my Grid to find my DataType in the datatemplate. I confirmed the assembly was present and accessible via code-behind, but XAML refuses to recognize it, I also tried slapping the Assembly attribute onto the Mapping tag but to no avail. The DataContract type is Franchise in the Log.DataContracts namespace.

< Mapping XmlNamespace="Log" ClrNamespace="Log.DataContracts" >
<Grid x:Class="Client.WPFControls.Page1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Log="Log">
<Grid>
<Grid.Resources>
<HierarchicalDataTemplate x:Key="FranchiseTemplate" DataType="{x:Type Log:Franchise}"
ItemsSource="{Binding Path=Elements}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=ElementId}" Margin="0 1.5 0 0" />
</StackPanel>
</HierarchicalDataTemplate>
</Grid.Resources>
<TreeView ItemsSource="{Binding Path=Elements}"
ItemTemplate="{StaticResource FranchiseTemplate}" />
</Grid>
</Grid>