opencv 3.0, about using Ptr<SURF> ( surf algorithm) - opencv

Question

this code is example about surf algorithm.
but when I execute this code, I have a error message.
error : error LNK2019: "public: static struct cv::Ptr __cdecl
cv::xfeatures2d::SURF::create(double,int,int,bool,bool)"
(?create#SURF#xfeatures2d#cv##SA?AU?$Ptr#VSURF#xfeatures2d#cv###3#NHH_N0#Z)
why I have this error? I have to use surf algorithm.
what is the solution about this error?
#include <stdio.h>
#include <iostream>
#include "opencv2/core.hpp"
#include "opencv2/features2d.hpp"
#include "opencv2/xfeatures2d.hpp"
#include "opencv2/highgui.hpp"
using namespace cv;
using namespace cv::xfeatures2d;
void readme();
int main()
{
Mat img_1 = imread( "a.jpg", IMREAD_GRAYSCALE );
Mat img_2 = imread( "b.jpg", IMREAD_GRAYSCALE );
if( !img_1.data || !img_2.data )
{ std::cout<< " --(!) Error reading images " << std::endl; return -1; }
//-- Step 1: Detect the keypoints using SURF Detector
int minHessian = 400;
Ptr<SURF> detector = SURF::create( minHessian );
std::vector<KeyPoint> keypoints_1, keypoints_2;
detector->detect( img_1, keypoints_1 );
detector->detect( img_2, keypoints_2 );
//-- Draw keypoints
Mat img_keypoints_1; Mat img_keypoints_2;
drawKeypoints( img_1, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT );
drawKeypoints( img_2, keypoints_2, img_keypoints_2, Scalar::all(-1), DrawMatchesFlags::DEFAULT );
//-- Show detected (drawn) keypoints
imshow("Keypoints 1", img_keypoints_1 );
imshow("Keypoints 2", img_keypoints_2 );
waitKey(0);
return 0;
}
/** #function readme */
void readme()
{ std::cout << " Usage: ./SURF_detector <img1> <img2>" << std::endl; }