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Looks that chart.js library isn’t loaded properly. Please check if there is a chart.js folder in your node_modules, or maybe you are missing import in your .html?
See line 195 in demo files:
https://github.com/carlcraig/tc-angular-chartjs/blob/master/demo/index.html#L195
- Chartjs-Chart.js not to be begin in Y-Axis
- Chartjs-The graph in the view is not displayed – Chart.js Angularjs
Source:stackexchange.com