Problem with gauges...

hello,
I'm trying to make a Gauge on DocumentWindow...but every time I have problem:

"Set connectionId threw an exception. Row number 10, position 14"

My xaml looks like this:

<docking:DocumentWindow x:Class="AirPlanePanel.View.FrontPanelView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:docking="http://schemas.actiprosoftware.com/winfx/xaml/docking"
xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared"
xmlns:prism="http://www.codeplex.com/prism"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:asd="clr-namespace:ActiproSoftware.Products.Gauge;assembly=ActiproSoftware.Gauge.Wpf351"
xmlns:gauge="http://schemas.actiprosoftware.com/winfx/xaml/gauge" <- here is a problem
mc:Ignorable="d"
d:DesignHeight="323" d:DesignWidth="400"
Title="Front Panel" >
<StackPanel>
<gauge:CircularGauge Margin="97,95,0,0" Name="circularGauge1" Height="102" Width="124" />
</StackPanel>
</docking:DocumentWindow>

I was trying with every Controls form Gauge section, and nothing good happened.