Hydrogen doesn't work at all anymore since the latest update of the Atom editor.
OS version:
macOS 10.15 (Catalina)
atom --version
Atom : 1.41.0
Electron: 4.2.7
Chrome : 69.0.3497.128
Node : 10.11.0
apm --version
apm 2.4.3
npm 6.2.0
node 10.2.1 x64
atom 1.41.0
python 2.7.16
git 2.23.0
Hydrogen version:
2.13.0
Have you installed and activated any of the Hydrogen plugins below ?
[Please post any error logs and the output of the developer tools as described in our [Debugging Guide](https://nteract.gitbooks.io/hydrogen/docs/Troubleshooting.html).]
Start Hydrogen.

[If applicable, add screenshots to help explain your problem.]
Hit the rebuild packages and then hit the rebuild hydrogen. If you no longer see that notification there is also a red bug icon on the status bar.
Most helpful comment
Hit the rebuild packages and then hit the rebuild hydrogen. If you no longer see that notification there is also a red bug icon on the status bar.