jupyter notebook execution error: "http://localhost:8889/tree?token=xxx" doesn’t understand the “open location” message
I got this error when I tried to launch jupyter notebook on a mac. It is not a fatal error. I could still go to browser directly and copy/paste the url manually. The error indicates that when the command automatically tried to launch a browser, it couldn't find the default browser in jupyter configuration file. The easy fix is to specify the browser. Here are the steps to do so; 1. Open ~/.jupyter/jupyter_notebook_config.py in an editor. If the file does not exist then you can create a default config file by typing the following command; jupyter notebook --generate-config 2. Search for a word "browser" to locate a following line. #c.NotebookApp.browser = '' By default it is commented. You can uncomment it and use one of the following values depending on your browser preference. # set default browser to chrome c.NotebookApp.browser = 'chrome' # set default browser to safari c.NotebookApp.browser =