Gender Classification-OpenCv with C++

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Hello everyone! Since im into Image processing and im trying to learn it by myself, specially with the gender classification subject
Im trying to implement a gender classifier for images with C++ along with OpenCv, I've tried many codes but none of them worked!

Like: http://docs.opencv.org/2.4/modules/co... This code generates the following errors: FaceRecognizer createFisherFaceRecognizer subspaceProject subspaceReconstruct It says all these identifiers are not identified In addition in the include: #include "opencv2/contrib/contrib.hpp"

I use 3.1 OpenCv version And 2015 Visual Studio And I want to run it on Windows environment

Any code you have tried and worked for the gender classification will be helpful:):)