Hide_code extension with JupyterHub

Hi there!

I am looking to set up a JupyterHub for a course I will be teaching this fall. I am able to get everything up and running, except for the ability to export the notebook as a PDF using the hide_code extension for Jupyter. Has anyone run into a similar issue?

Here’s what I follow in setting this up: data_science_campaigns/setup.md at 390e0c68ae3d84c3f664c0a683329bd40c7bf50a · joshuakalla/data_science_campaigns · GitHub

However, I get a 404 : Not Found error when I try exporting as a PDF. Any and all help would be much appreciated. Thanks!