PDFsharp & MigraDoc Foundation

I am getting this error when it is rendering the document only when I try adding a chart to a section.

eg. Dim scaleChart As MigraDoc.DocumentObjectModel.Shapes.Charts.Chart = _section.AddChart



I am using the same dll as is used in the MigraDoc sample code.

I am using these import (using) statements:

Imports MigraDoc.DocumentObjectModel
Imports MigraDoc.Rendering
Imports Microsoft.VisualBasic
Imports PdfSharp.Drawing
Imports PdfSharp.Pdf
Imports PdfSharp.Drawing.Layout
Imports System.Reflection
Imports System.Linq
Imports PdfSharp.Pdf.IO
Imports MigraDoc.DocumentObjectModel.Shapes
Imports MigraDoc.DocumentObjectModel.Shapes.Charts

Ok, I found it by looking at object browser in the sample project.
It is a separate dll.