I can’t launch the Jupter notebook from Anaconda Navigator, although I was able to do so yesterday. I got the following 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 'http://127.0.0.1:8081/jupyterhub/hub/api'. 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.