Missing File: Plückers conoid.txt build error

First, A very good toolkit for Wpf.... just what I'm looking for. However, I wanted to learn more about Wpf 3d graphical UIs so I download the Helix source for this purpose. But upon building the project, I get a file error: Error 1 File 'Expressions\Plückers conoid.txt' cannot be found. in project: SurfaceDemo.

How such I workaround this error?

King