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from the mentioned guide :
Finally, for now, you must install and add to your layouts / templates the Chartjs library that can be easily found for download at: http://www.chartjs.org. This setting will also be improved.
so you will need JS and CSS files which you can get from the Link
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<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.js"></script>
Doesn’t explicitly say on the Repo, but we need this.
Source:stackexchange.com