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fitLine always crashes

Hi i try to use fitLine but it always crashes. I already tried to modify input data (cv::Mat, std::vector<cv::pointd>) and output data(cv::Vect4d, std::vector<cv::pointd>(2), std::vector<double>(4)) formats.

Here is my Code:

std::vector<cv::Point2d> points;
// [...] // push_back some (26) points
std::vector<double> line(4,0);

now it crashes. Iam using winxp VS2010 with a opencv 2.41 build I got no call stack and the crash seems to happen in kernel32.dll xstring

Where is my failure?