[Python] cv.findContours() -> ValueError: not enough values to unpack (expected 3, got 2),...

My simple Python code is this

import cv2

img=cv2.imread('Materials/shapes.png')

blur=cv2.GaussianBlur(img,(3,3),0)
gray=cv2.cvtColor(blur,cv2.COLOR_BGR2GRAY)
returns,thresh=cv2.threshold(gray,80,255,cv2.THRESH_BINARY)

ret,contours,hierachy=cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

for cnt in contours:

area=cv2.contourArea(cnt) #contour area

if (area>1220):
cv2.drawContours(img,[cnt],-1,(0,255,0),2)
cv2.imshow('RGB',img)
cv2.waitKey(1000)
print(len(cnt))

import numpy as np

contours=np.array(contours)

print(contours)


This worked fine. But recently without me even making any changes. This was throwed to me

ret,contours,hierachy=cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

ValueError: not enough values to unpack (expected 3, got 2)
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