This happens with most of the notebooks, any idea?
Try using another browser or another network. You can also restart kernel or delete browser cache to see if it helps. Finally, if you are using a VPN or DNS, make sure that they are functioning correctly!
Hope this helps, feel free to ask if you nees further assistance!
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I am not using VPN, also I tried to restart the kernel or a different browser but non of them helped, even clearing the cache or the cookies
try to run the same notebook on your side! if that is possible
Unfortunately, I don’t have access to the course notebooks and I just suggested some general advices that they can solve the problem. But, other mentors can guide you, if your problem still persists!