Error inlcude opencv2/face.hpp

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Hello everybody. I am new baby for opencv. I have installed opencv 3.X version. Also i downloaded opencv_contrib-master and followed instruction as mentioned https://github.com/Itseez/opencv_contrib.

In my opencv/build/modules - contrib_world - face - etc then I used Cmake and generate and configure without any error.

core.hpp and improc.hpp are working just fine but the problem with face.hpp?

I don't know what should i do now?

Any suggestion.

thank you