Why not work createFisherFaceRecognizer() in opencv java?

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I import org.opencv.contrib.faceRecognizer in me project? but when i want use this class i see error, can you help why i can not use this same code bottom?

FaceRecognizer rec = new FaceRecognizer(); this method is not work too

FaceRecognizer rec=createLBPHFaceRecognizer(); or FaceRecognizer rec=createEigenFaceRecognizer(); or FaceRecognizer rec=createFisherFaceRecognizer();