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How to fix this error: grayscaled = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) cv2.error: /io/opencv/modules/imgproc/src/color.cpp:10638: error: (-215) scn == 3 || scn == 4 in function cvtColor?

My code is : import cv2 import numpy as np

img = cv2.imread('bookpage.jpg') retval, threshold = cv2.threshold(img, 12, 255, cv2.THRESH_BINARY)

grayscaled = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) retval2, threshold2 = cv2.threshold(grayscaled, 12, 255, cv2.THRESH_BINARY) gaus = cv2.adaptiveThreshold(grayscaled, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 115, 1)

cv2.imshow('original', img) cv2.imshow('threshold', threshold) cv2.imshow('threshold2', threshold2) cv2.imshow('gaus', gaus) cv2.waitKey(0) cv2.destroyAllWindows()

How to fix this error: grayscaled = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) cv2.error: /io/opencv/modules/imgproc/src/color.cpp:10638: error: (-215) scn == 3 || scn == 4 in function cvtColor?

My code is : :

import cv2
import numpy as npnp
  img = cv2.imread('bookpage.jpg')
retval, threshold = cv2.threshold(img, 12, 255, cv2.THRESH_BINARY)cv2.THRESH_BINARY)
  grayscaled = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
retval2, threshold2 = cv2.threshold(grayscaled, 12, 255, cv2.THRESH_BINARY)
gaus = cv2.adaptiveThreshold(grayscaled, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 115, 1)1)
 cv2.imshow('original', img)
cv2.imshow('threshold', threshold)
cv2.imshow('threshold2', threshold2)
cv2.imshow('gaus', gaus)
cv2.waitKey(0)
cv2.destroyAllWindows()cv2.destroyAllWindows()