Hi, I’ve been studying Course 5 Week 4 of the Deep Learning Specialization. Opening the Programming Assignment (Transformers Architecture with Tensorflow) triggers the following error:
404 : Not Found
You are requesting a page that does not exist!
The issue persists after refreshing the website or restarting the browser.
Just refreshing the page will not do anything. It looks like that assignment did not get correctly initialized in your account. Please try the “Get a Fresh Copy” procedure documented on this thread (linked from the DLS FAQ). If you have trouble finding the “three dots” that are critical to get to the relevant link, here’s a screenshot with them highlighted:
Note that there are different procedures on the Coursera platform. Here’s the thread for that case.
Hi Paul, thank you very much for your suggestions. I’ve restored my Jupyter notebook to the original version several times on Firefox and Safari. But the 404: Not Found error persists. I’m using the DeepLearning.ai platform.
Just to make sure I understand what you are saying: you have actually done the procedure of clicking the three dots and then clicking “Restore Original Version” and you’re saying that has not worked? Are you sure you hit browser “Refresh” after you did the “Restore”?
Just to confirm this procedure, I purposely deleted one of my DLS C5 notebooks and went through the steps and it all worked for me. I did not end up having to click “Refresh” in order to get the restored notebook to load.
One other note is that I’m using Chrome on MacOS. If it really doesn’t work for you using Firefox or Safari, it would be worth trying Chrome.
Yes I’m saying that hasn’t worked.
Refreshing the website after restoring original version didn’t help either.
So you’re saying that it worked? I think we are having language issues here.
Or are you saying that you had previously worked on this notebook and are hoping to get back your version of the notebook. If so, then I’m sorry to be the bearer of bad news, but that’s not the way the system works. If you didn’t save a copy, then there is no way to get back your version of the notebook. You can only get a clean version.
Thanks for the suggestion. I’ve tried Chrome on MacOS but it hasn’t worked either.
Are you able to load the C5W4 Programming Assignment (Transformers Architecture with Tensorflow) on your machine?
I’ve edited my last response.
Yes, it works for me.
Of course this is the last assignment in DLS C5. I assume you have been through all the previous assignments and have not had a problem like this before. So has anything changed in your setup? Different computer, different network?
Good to know 
I haven’t had 404: Not Found with any other assignment in C5. I’ve been using the same laptop and the same network.
Oh, wait. What I showed above in the screenshot was before I tried to delete that particular notebook. I had worked that assignment back in early December. But now if I try to get a clean copy using the procedure above, I am getting the same problem that you are having: I just get 404 every time.
So I apologize: it looks like there really is a problem. But I had tried deleting one of the C5 W1 assignments and that worked fine: I was able to get back a clean copy.
So it appears that the problem is specific to this one assignment. Let me try some experiments with Week 3.
I will try my best to raise an alarm with the course staff! 
@paulinpaloalto Thank you very much for your help! I do hope that the course staff could fix this soon.
FWIW I tried deleting one of the C5 W3 assignments and then restoring the original version and did not have a problem.
So whatever the problem is, it seems to be specific to the C5 W4 A1 assignment.
More news as soon as I hear anything back from the course team!
Ok, we have great news! I think this may break the record for fastest response to a bug, but it is now fixed. Turns out they changed the name of the assignment file from
C5_W4_Assignment_1.ipynb
to
C5_W4_Assignment.ipynb
But apparently the change didn’t get made in all the places it needed to. Fixed now!
Please give the “Restore Original Version” another try and let us know if it also works for you.
That’s great news! Now it works for me too. Thank you very much for your efforts!
I’m so glad that we got a quick response from the course staff on this. Mubsi to the rescue!
