I am having the following XAML code, which throws error following error pointing to line# 16.

> 
> the property 'Content' is set more
>  than once
> 
> 
> 

Any thoughts?

```
1       <Grid x:Name="LayoutRoot" Width="970" Height="460" Background="White">  
2           <Grid.RowDefinitions>  
3               <RowDefinition Height="*"/>
4               <RowDefinition Height="80"/>
5           </Grid.RowDefinitions>
6           <Border Margin="3" BorderBrush="#FF464646" BorderThickness="1" CornerRadius="5" Grid.Row="0">
7               <Border.Background>
8                   <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
9                       <GradientStop Color="#FF5B5A5A" Offset="0.02"/>
10                      <GradientStop Color="#FF3B3B3B" Offset="0.213"/>
11                      <GradientStop Color="#FF535151" Offset="0.807"/>
12                  </LinearGradientBrush>
13              </Border.Background>
14   
15               <Liquid:Viewer Content="Viewer">
16                   <Image Source="Images/planet.jpg" Opacity="0.8" Stretch="Fill" />
17               </Liquid:Viewer>
18   
19           </Border>
20          <Border Margin="3" BorderThickness="1" CornerRadius="5" Grid.Row="1">
21              <Border.Background>

```