DataTrigger Error - wpf

Question

I am working with some multi-trriggers as per this posting. The binding and error are below.
I am using a custom markup extension to display the resource image so it could be suspect but I don't think so since I have used it in styles before.
The error message says I am applying the wrong property for the type and I don't see why yet.
Cheers,
Berryl
triggers
<Style x:Key="AvatarPathImageStyle" TargetType="{x:Type Image}">
<Setter Property="Source" Value="{Binding AvatarPath}"/>
<Setter Property="Height" Value="96"/>
<Setter Property="Width" Value="96"/>
<Setter Property="Stretch" Value="UniformToFill"/>
<Style.Triggers>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding AvatarPath}" Value="{x:Null}" />
<Condition Binding="{Binding Gender}" Value="{x:Static domain:Gender.Female}"/>
</MultiDataTrigger.Conditions>
<Setter Property="Source" Value="{resx:Resx ResxName=Smack.Parties.Presentation.Resources.PersonDetailView, Key=Img_Female}"/>
</MultiDataTrigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding AvatarPath}" Value="{x:Null}" />
<Condition Binding="{Binding Gender}" Value="{x:Static domain:Gender.Male}"/>
</MultiDataTrigger.Conditions>
<Setter Property="Source" Value="{resx:Resx ResxName=Smack.Parties.Presentation.Resources.PersonDetailView, Key=Img_Male}"/>
</MultiDataTrigger>
</MultiDataTrigger>
</Style.Triggers>
</Style>
binding
<Image Grid.Column="1" Grid.Row="4"
HorizontalAlignment="Center" Margin="10, 0" Style="{StaticResource AvatarPathImageStyle}"
/>
error
System.Windows.Markup.XamlParseException occurred
... InnerException: System.ArgumentException
Message='System.Windows.Controls.Image' is not a valid value for the 'System.Windows.Controls.Image.Source' property on a Setter.
...
update
Accessing the image statically also gets an Invalid Type error:
<Setter Property="Source" Value="{x:Static imgResources:PersonDetailView.Img_Female}"/>

Answer 1

Comment converted to answer:
The reason for the error is that images stored in a resx file are of type System.Windows.Drawing.Image, which are not directly compatible with WPF. You can write a converter, but unless you have a strong reason for using a resource dictionary I would just embed the images and reference them by URL relative to the XAML file