Assertion error with imshow (3 Solutions!!)

Assertion error with imshow (3 Solutions!!)

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error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' |cv2.error
error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' |cv2.error
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error:(-215:Assertion failed) size.width0 && size.height0 in function 'cv::imshow' SOLVED in opencv

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