[Python] google colab, cv2_imshow throws error: 'NoneType' object has no attribute 'clip'

I am learning the basics of OpenCV and while running the following piece of code in google colab, it gives an error.

from google.colab.patches import cv2_imshow
import cv2
img=cv2.imread("geeks14.png")
cv2_imshow(img)


The error is

---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-14-569c91be5363> in <module>()
2 import cv2
3 img=cv2.imread("geeks14.png")
----> 4 cv2_imshow(img)

/usr/local/lib/python3.7/dist-packages/google/colab/patches/__init__.py in cv2_imshow(a)
20 image.
21 """
---> 22 a = a.clip(0, 255).astype('uint8')
23 # cv2 stores colors as BGR; convert to RGB
24 if a.ndim == 3:

AttributeError: 'NoneType' object has no attribute 'clip

Continue reading...