Error while running on hand.jpg image

[abdul-rehman-2050]

Hello ! when I run on Image file of hand.jpg or any other image I get this error

Traceback (most recent call last): File "C:\Users\Strange Lab\Documents\Python Projects\Hand Keypoints\MV_HandKeyPointDetector-master\handPoseImage.py", line 28, in output = net.forward() error: C:\projects\opencv-python\opencv\modules\dnn\src\dnn.cpp:1430: error: (-215) output_slice.isContinuous() && output_slice.size == curr_output.size in function cv::dnn::experimental_dnn_v3::Net::Impl::fuseLayers

[abdul-rehman-2050]

I am using it in Python 2.7 and OpenCV 3.4

[abdul-rehman-2050]

I upgraded my opencv with this command pip install opencv-contrib-python==4.1.0.25 and issue is resolved. But Do not have any Idea why in older version it was not working and what cause this error? any idea?