because I had only one or two of my images like so I manually fixed them:
import cv2
import numpy as np
img = cv2.imread('110249.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img2 = np.zeros_like(img)
img2[:,:,0] = gray
img2[:,:,1] = gray
img2[:,:,2] = gray
cv2.imwrite('110249.jpg', img2)