ValueError: not enough values to unpack

[plysytsya]

I get the following error when I try to run the script:

Traceback (most recent call last):
File "main.py", line 276, in
contr_img, contours, hierarchy = cv2.findContours(contr_retrival,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)

[plysytsya]

Fixed it by downgrading to opencv version 3.4.3.18

[Designer-ViditShah]

You may also do it by removing the first argument since it's not used later anywhere in the code.
Argument name "contr_img"
Remove the argument and code works fine