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I just looked at the JS Fiddle and replacing the Chart JS script links worked for me. I used version 2.7.0 instead of 2.4.0 from CDNJS.
Iโm not sure you need both the libraries either. Just using https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.min.js
should be enough.
Hope this helps.