Kernel Error while running Jupyter Notebook in Python3

Hi,

I am new to using Jupyter notebooks and I am getting a "Kernel error" in a red box on top right of my notebook. I have referred to the following related articles:

https://github.com/jupyter/notebook/issues/2301
https://github.com/jupyter/notebook/issues/3556

Further to these articles, appreciate if I can get assistance with the following questions:

1. By running jupyter kernelspec list, do you mean that I should just type jupyter kernelspec list without any quotes and without anything preceding / following this in a code cell and run it?

2. If so, I have tried that and there is no output. What should I do next?

As additional information, I have other codes written in the same notebook with input, print etc. which were successfully running earlier but from the time that I have started seeing Kernel error none of these codes are running.

Thanks!

Review the linked issues and the reported `jupyter kernelspec list` command first. Determine why the Python 3 kernel is unavailable and identify the relevant kernel configuration or error details; done means the notebook kernel starts and its existing input and print cells run again.

Written by the indexing model from the issue text.