TypeError: call(): incompatible function arguments

• face_recognition version: 1.2.2
• Python version: 3.6.5
• Operating System: Windows 7 / Git Bash 2.17.1.2

Description

return face_detector(img, number_of_times_to_upsample)

TypeError: call(): incompatible function arguments. The following argument types are supported:
1. (self: dlib.fhog_object_detector, image: array, upsample_num_times: int=0)

How to fix this ?

What I Did

$pip3 install dlib (version is 19.13.1)
$pip3 install face_recognition (version 1.2.2)
$cd ~/cv2 (my sample code is in https://github.com/rkuo2000/cv2/cam_eye_tracking.py)
$python cam_eye_tracking.py

Traceback (most recent call last):
File "cam_eye_tracking.py", line 11, in
face_landmarks_list = face_recognition.face_landmarks(image)
File "C:\Program Files\Python36\lib\site-packages\face_recognition\api.py", line 173, in face_landmarks
landmarks = _raw_face_landmarks(face_image, face_locations)
File "C:\Program Files\Python36\lib\site-packages\face_recognition\api.py", line 153, in _raw_face_landmarks
face_locations = _raw_face_locations(face_image)
File "C:\Program Files\Python36\lib\site-packages\face_recognition\api.py", line 102, in _raw_face_locations
return face_detector(img, number_of_times_to_upsample)
TypeError: call(): incompatible function arguments. The following argument types are supported:
1. (self: dlib.fhog_object_detector, image: array, upsample_num_times: int=0) -> dlib.rectangles

Invoked with: <dlib.fhog_object_detector object at 0x000000000A3D6570>, None, 1

Start with cam_eye_tracking.py and trace the image passed to face_recognition.face_landmarks, then inspect face_recognition/api.py around _raw_face_locations and line 102. Confirm why the detector receives None instead of an image; done means the sample reaches face detection with a valid image and no incompatible-arguments error.