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sift and surf in opencv 3.2

Hi, i build opencv 3.2 with opencv-contrib moduls also add [ #include "opencv2/xfeatures2d.hpp"] and [using namespace cv::xfeatures2d;] to my code but i have error when compile it. i used these commands for surf:

    Ptr<SURF> detector; 
     detector->detect( imgbackground, Keypoints1 );

please guide me. thanks,