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OpenCV Error: Assertion failed ((npoints = prevPtsMat.checkVector(2, CV_32F, true)) >= 0) in void cv::calcOpticalFlowPyrLK

Hi everybody,

I am trying to run following code but it crushes in calcOpticalFlowPyrLK with following error:
Code: http://pastebin.com/bWZ8CV5F
Error: http://pastebin.com/TjDqGxJt

Could you please help me?