I can launch Anacnda Jupyter Notebook

Hi everyone!

When I clicked on Launch in Anaconda Navigator today, I received the following error message

Sorry, this is not working properly!

Our server encountered an unexpected condition that prevented it from fulfilling your request.

Internal Server Error

Failed to connect to Hub API at ''. Is the Hub accessible at this URL (from host: green-nbjupyterhub12)? Make sure to set c.JupyterHub.hub_ip to an IP accessible to single-user servers if the servers are not on the same host as the Hub.

Yesterday the Jupyter Notebook was able to start.

Sorry! read can to can’t in the topic title. “I can’t launch Anaconda Jupyter Notebook”

Now the Jupyter Notebook can be started, the kernel can be selected, and all of its functionality has been restored.