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You should use one channel cv::Mat (see docs here:

When you use cv::Mat(pts) you get two channels matrix Kx1 with type CV_32FC2, so you should call reshape to get matrix K*2x1 with type CV_32FC.

std::vector<cv::Point2f> pts(K);
cv::flann::Index tree= cv::flann::Index(cv::Mat(pts).reshape(1),cv::flann::KDTreeIndexParams(1));