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Error while including face.hpp file

Hi, I am working on face recognition. When i try to add face.hpp, it is showing below errors.

In file included from /usr/include/opencv2/face.hpp:51:0,
             from /usr/include/opencv2/face/facerec.hpp:11,
             from processImage.cpp:11:
/usr/include/opencv2/face/predict_collector.hpp:76:31: error: expected unqualified-id before ‘const’
 CV_WRAP virtual bool emit(const int label, const double dist, const int state = 0); //not abstract while Python generation require non-abstract class
                           ^~~~~
/usr/include/opencv2/face/predict_collector.hpp:76:31: error: expected ‘)’ before ‘const’

enter code here

/usr/include/opencv2/face/predict_collector.hpp:91:23: error: expected unqualified-id before ‘const’
 CV_WRAP bool emit(const int label, const double dist, const int state = 0);
                   ^~~~~
/usr/include/opencv2/face/predict_collector.hpp:91:23: error: expected ‘)’ before ‘const’
Makefile:2635: recipe for target 'processImg.o' failed

am i missing any thing else.

I added #include opencv2/face.hpp"" and i got those errors.

Thanks Tirupathi