Setting properties to background subtractor MOG2 giving access violation exception

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C#

OpenCV

I am using opencvsharp 3.1.0 with visual studio 2015 for a project detecting moving objects. I am using BackgroundsubtractorMOG2 for creating foreground mask.I can successfully run the program with default values but throws access violation exception if I try to set or get properties of BackgroundsubtractorMOG2

What I have tried:

VideoCapturecap = new VideoCapture();
cap.Open(0);
BackgroundSubtractorMOG2 pMOG =BackgroundSubtractorMOG2.Create();
pMOG.shadowThreshold=0.6; // Exception thrown here
while(true)
{
    Mat readframe = new Mat();
    cap.Read(readframe);

    if(!readframe.Empty())
    {

            frame = readframe.Clone();
            frameresult = fc.violationcheck(frame, pMOG);

        }
        else
        {
            frameresult = readframegray;
        }
      }