Building error for facetracker addon

Hello,guys

I just create the project with addons(facetracker,Cv,openCv)and build directly.

And It pop up the many errors as below:

1>C:\of_v0.11.2_vs2017_release\addons\ofxFaceTracker\libs\FaceTracker\src\lib\FDet.cc(150,9): error C2065: ‘classifier’: Undeclared identifier

How can I resolve these problems?

Thank you very much !!