问似乎无法正确运行python MSS库

EN

Traceback (most recent call last):
  File "C:\Users\Ryan Webb\Documents\OpenCV-objectDetection\mss.py", line 4, in <module>
    from mss.windows import MSS as mss
  File "C:\Users\Ryan Webb\Documents\OpenCV-objectDetection\mss.py", line 4, in <module>
    from mss.windows import MSS as mss
ModuleNotFoundError: No module named 'mss.windows'; 'mss' is not a package

from mss import mss
import cv2
from PIL import Image
import numpy as np
from time import time

mon = {'top': 100, 'left':200, 'width':1600, 'height':1024}

sct = mss()

while 1:
    begin_time = time()
    sct_img = sct.grab(mon)
    img = Image.frombytes('RGB', (sct_img.size.width, sct_img.size.height), sct_img.rgb)
    img_bgr = cv2.cvtColor(np.array(img), cv2.COLOR_RGB2BGR)
    cv2.imshow('test', np.array(img_bgr))
    print('This frame takes {} seconds.'.format(time()-begin_time))
    if cv2.waitKey(25) & 0xFF == ord('q'):
        cv2.destroyAllWindows()
        break

C:\Users\Ryan Webb>pip list
Package           Version
----------------- --------
astroid           2.6.5
colorama          0.4.4
isort             5.9.3
lazy-object-proxy 1.6.0
mccabe            0.6.1
MouseInfo         0.1.3
mss               6.1.0
numpy             1.21.1
opencv-python     4.5.3.56
Pillow            8.3.1
pip               21.1.3
PyAutoGUI         0.9.53
PyGetWindow       0.0.9
pylint            2.9.6
PyMsgBox          1.0.9
pyperclip         1.8.2
PyRect            0.1.4
PyScreeze         0.1.27
PyTweening        1.0.3
pywin32           301
setuptools        56.0.0
toml              0.10.2
wrapt             1.12.1
WARNING: You are using pip version 21.1.3; however, version 21.2.3 is available.
You should consider upgrading via the 'c:\program files\python39\python.exe -m pip install --upgrade pip' command.