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I ran into the same issueβ¦
I suppose its something with the versions of both angular and chart js. From the docs it is recommended to use AngularJS (requires at least 1.4.x) and Chart.js (requires Chart.js 2.x). I had no such issues with Anguar 1.6.4 and chart js 2.6.0 till I updated Angular to 1.6.6. However the error you got is by use of chartJs less than version 2. For me I am getting a different error with angular 1.6.6β¦ i.e.
TypeError: arcOpts is undefined
Source:stackexchange.com