Python • AttributeError: 'NoneType' object has no attribute 'shape'

Code:

(venv) cheeyong@raspberrypi:~ $ python3 /home/cheeyong/github1.pypygame 2.5.2 (SDL 2.28.3, Python 3.11.2)Hello from the pygame community. https://www.pygame.org/contribute.htmlTraceback (most recent call last):  File "/home/cheeyong/github1.py", line 35, in <module>    frame = imutils.resize(frame, width=900)            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/home/cheeyong/venv/lib/python3.11/site-packages/imutils/convenience.py", line 69, in resize    (h, w) = image.shape[:2]             ^^^^^^^^^^^AttributeError: 'NoneType' object has no attribute 'shape'(venv) cheeyong@raspberrypi:~ $ 

Code:

from scipy.spatial import distanceimport dlibimport cv2from imutils import face_utilsimport imutilsimport pygameimport RPi.GPIO as GPIOBUZZER_PIN = 16GPIO.setmode(GPIO.BCM)GPIO.setup(BUZZER_PIN, GPIO.OUT)def eye_aspect_ratio(eye):    a = distance.euclidean(eye[1], eye[5])    b= distance.euclidean(eye[2], eye[4])    c= distance.euclidean(eye[0], eye[3])    ear = (a + b) / (2.0 * c)    return earpygame.mixer.init()pygame.mixer.music.load('/home/cheeyong/Downloads/alarm.wav')thresh = 0.25frame_check = 50count = 0detect = dlib.get_frontal_face_detector()predict = dlib.shape_predictor("/home/cheeyong/Downloads/shape_predictor_81_face_landmarks.dat")(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_68_IDXS["left_eye"](rStart, rEnd) = face_utils.FACIAL_LANDMARKS_68_IDXS["right_eye"]cap = cv2.VideoCapture(0)while True:    ret, frame = cap.read()    frame = imutils.resize(frame, width=900)    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)    subjects = detect(gray, 0)    for subject in subjects:        shape = predict(gray, subject)        shape = face_utils.shape_to_np(shape)        leftEye = shape[lStart:lEnd]        rightEye = shape[rStart:rEnd]        leftEyeHull = cv2.convexHull(leftEye)        rightEyeHull = cv2.convexHull(rightEye)        leftEyeAspectRatio = eye_aspect_ratio(leftEye)        rightEyeAspectRatio = eye_aspect_ratio(rightEye)        EyeaspectRatio = (leftEyeAspectRatio + rightEyeAspectRatio) / 2        cv2.drawContours(frame, [leftEyeHull], -1, (0, 255, 0), 1)        cv2.drawContours(frame, [rightEyeHull], -1, (0, 255, 0), 1)        if (EyeaspectRatio < thresh):            count += 1            if count >= frame_check:                pygame.mixer.music.play(-1)                cv2.putText(frame, "  Driver is Drowsy ", (150,100), cv2.FONT_HERSHEY_SIMPLEX, 1.5, (0, 0, 255), 2)        else:            pygame.mixer.music.stop()            count = 0    cv2.imshow("Frame", frame)    key = cv2.waitKey(1)    if key == ord("q"):     breakcv2.destroyAllWindows()cap.stop()