Dynamic Data Display Getting Started

Hi,

I downloaded DynamicDataDisplay.dll and added to my WPF project's references. Then I added the simple code that is shown on https://dynamicdatadisplay.codeplex.com/ home page

linegraph.Plot(x,y); // x and y are IEnumerable<double> 

and the Xaml code 

<d3:ChartBottomTitle="Argument"LeftTitle="Function"><d3:LineGraphx:Name="linegraph"Description="Simple linegraph"Stroke="Blue"StrokeThickness="3"/></d3:Chart>

Then I get the error that says 

What could be the problem? I couldn't even get started.