Value cannot be null. Parameter name: from WPF button binding datatrigger - wpf

Question

I've been struggeling with this issue today when as soon as I try to bind a data trigger on a button I get this issue and I can't find our the issue. The button is contained in a listview which is bound to a dataset.
There is my button code:
<Button
Grid.Row="1"
Grid.Column="0"
Click="BtnAddToCart_Click"
MinWidth="230">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Visibility" Value="Hidden"/>
<Setter Property="Margin" Value="7,5,0,0"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=OrderQty, Converter={StaticResource GreaterThanZero}}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
<Button.Template>
<ControlTemplate>
<WrapPanel HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
<WrapPanel.Style>
<Style TargetType="{x:Type WrapPanel}">
<Setter Property="Background" Value="#ec3c42"/>
<Setter Property="TextBlock.Foreground" Value="White"/>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="White"/>
<Setter Property="Cursor" Value="Hand"></Setter>
<Setter Property="TextBlock.Foreground" Value="#ec3c42"></Setter>
</Trigger>
</Style.Triggers>
</Style>
</WrapPanel.Style>
<WrapPanel.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Padding" Value="10,10" />
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="FontSize" Value="15"/>
</Style>
</WrapPanel.Resources>
<TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" Text="Ajouter aux Commandes"></TextBlock>
<fa:FontAwesome Visibility="Hidden" VerticalAlignment="Center" HorizontalAlignment="Right" Icon="check">
<fa:FontAwesome.Triggers>
<DataTrigger Binding="{Binding Path=ShowAsChecked}" Value="true">
<Setter Property="Visibility" Value="Visible"></Setter>
</DataTrigger>
</fa:FontAwesome.Triggers>
</fa:FontAwesome>
</WrapPanel>
</ControlTemplate>
</Button.Template>
</Button>
The issue seems to happen when I add this piece of code:
<fa:FontAwesome.Triggers>
<DataTrigger Binding="{Binding Path=ShowAsChecked}" Value="true">
<Setter Property="Visibility" Value="Visible"></Setter>
</DataTrigger>
</fa:FontAwesome.Triggers>
When I remove the trigger the code run as expected.
Even when I bind it to a property that is working on a different level it doesn't work.
I tried changing the binding to:
Binding="{Binding Path=OrderQty, Converter={StaticResource GreaterThanZero}}
and it's still giving me the error. I tried to look up some code example but didn't find anything about that issue (since the error is pretty common it's hard to tell what is going on).

Answer 1

Try
<fa:FontAwesome Visibility="Hidden" VerticalAlignment="Center" HorizontalAlignment="Right" Icon="check">
<fa:FontAwesome.Style>
<Style TargetType="fa:FontAwesome">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ShowAsChecked}" Value="true">
<Setter Property="Visibility" Value="Visible"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</fa:FontAwesome.Style>
</fa:FontAwesome>