Permission denied: release/W2A1/Optimization_methods.ipynb

For some strange reason I am getting this error while submitting assignment 2. I had no problems submitting assignments 1 and 3.
I tried incognito mode on browser, same problem.
Tried a different machine, same results. Tried other browsers besides chrome, same problem.

Any idea ?

There was a Coursera bug that some people got hit by a couple of weeks ago. One thing to try is simply to click Help -> Get Latest Version and follow through that process without renaming your notebook and see if that fixes it. That’s the “Help” link in the upper right corner of the browser tab.

That worked. Thank you