TypeError: Incorrect type of self(must be 'face_faceRecognizer' or its derivative

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Hi, I am trying to execute face recognition code(opencv 3.4 and python2.7), i get the following error : TypeError: Incorrect type of self(must be 'face_faceRecognizer' or its derivative.

the code and defect attached

recognizer = cv2.face_LBPHFaceRecognizer()

if os.path.exists("model.yaml"): recognizer.read("model.yaml")

Can you please help me fix this.