cv2.error: OpenCV(4.5.1) error: (-2:Unspecified error) File can't be opened for reading! in function 'cv::face::FaceRecognizer::read'

Question

i have tried to read the training set data and the above errors pops out

my function is

def TrackImages():
    recognizer = cv2.face.LBPHFaceRecognizer_cre