这是我的代码剪切，我收到错误
错误： - 未定义引用`cv :: face :: FaceRecognizer :: predict（cv :: _ InputArray const＆amp;）const'|
任何人都可以帮助我，提前致谢
#include <opencv2/core/core.hpp>
#include "opencv2/core.hpp"
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>
#include "opencv2/imgcodecs.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/objdetect.hpp"
#include "opencv2/face/facerec.hpp"
#include "opencv2/face.hpp"
#include<bits/stdc++.h>
using namespace cv;
using namespace std;
using namespace cv::face;
/*declaration of global variables */
int image_flag=1;//flag for depicting success/failure of reading a image
CascadeClassifier face_cascade;
CascadeClassifier eyes_cascade;
String face_cascade_name, eyes_cascade_name;
vector<int> labels;
Ptr<face::FaceRecognizer> model = face::createFisherFaceRecognizer();