wpftoolkit debugging error: Missing DataPointSeries.cs?

Jan 16, 2014 at 3:40 PM
I used wpftoolkit to depict a chart but after depicting when I close the window visual studio suspends.

i debugged the program and it opens a window:

no source available .

and it then brings a window for openning DataPoints.cs:


but there is no such file there!

what goes wrong??