# 404 GET /nbextensions/jupyter\_jsmol/extension.js

**URL:** <https://discourse.jupyter.org/t/404-get-nbextensions-jupyter-jsmol-extension-js/9265>\
**Category:** Notebook\
**Tags:** ipython, jupyterhub\
**Created:** [May 19, 2021, 8:00pm UTC](https://discourse.jupyter.org/t/404-get-nbextensions-jupyter-jsmol-extension-js/9265 "2021-05-19T20:00:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Andre\_Lucchini](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/andre_lucchini/32/4447_2.png) [@Andre\_Lucchini](https://discourse.jupyter.org/u/Andre_Lucchini)\
**Post date:** [May 19, 2021, 8:00pm UTC](https://discourse.jupyter.org/t/404-get-nbextensions-jupyter-jsmol-extension-js/9265/1 "2021-05-19T20:00:17Z")

</div>

Hi, I just downloaded Rise from the conda, as showed on jupyter’s github, but when I’m using jupyter, the button to enter the presentation doesn’t appear. Usually I use the sagemath kernel, but it doesn’t even appear with the python kernel. The two error messages keep appearing in the terminal:

404 GET /nbextensions/jupyter\_jsmol/extension.js  
404 GET /nbextensions/widgets/notebook/js/extension.js

I’ve tried several of the suggestions I found here on other topics, but none of them were effective. I will leave information about my OS and my browser, along with a picture of the browser console showing where the errors occur, as I no longer know what I can do.

- My OS: Linux Mint 20.1 Cinnamon, Cinnamon version: 4.8.6
- I have python in the following versions: 2.7.18, 3.8.5 e 3.9.4(conda). I installed them from the default repository of my OS, that is, I did not configure any new PPA.
- My browser info: Google Chrome - Version 90.0.4430.212 (Official version) 64 bits
- I just installed the new version of sagemath and my jupyter notebook was installed by anaconda. It is up to date, but still has problems with the extension. I will send the snapshot of the browser console.  
 ![browser](https://canada1.discourse-cdn.com/flex031/uploads/jupyter/original/2X/b/b6c442e6313721bc67de064f944114610f377281.png)

In advance, I thank you for your attention.