How to install in a gitbook.com hosted book?

[kyrylkov]

I enabled this plugin in gitbook.com plugin store but it doesn't work, having require in JavaScript:

require(["gitbook"], function(gitbook) {
    // Load analytics.js
    gitbook.events.bind("start", function(e, config) {
        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
        })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

        var cfg = config.ga;
        ga('create', cfg.token, cfg.configuration);
    });

    // Notify pageview
    gitbook.events.bind("page.change", function() {
        ga('send', 'pageview', window.location.pathname+window.location.search);
    });
});

Please see docs.entriwise.com for concrete example.

How do I fix it?