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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 = 'Safari'


That resolved the problem for me. If it still doesn't work for you then you could try setting BROWSER variable in ~/.bash_profile as follows;

     export BROWSER=<browser-location>

     For example;
     export BROWSER=/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome


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