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Have a look at the docs for chart.js.
It looks like you are not passing a valid node, jQuery instance, 2d context, or string id of the canvas of where you want to draw the chart to new Chart()
.
const ctx = document.querySelector('#doughnutChart');
var myDoughnutChart = new Chart(ctx, {
type: 'doughnut',
data: {...}
};
Alternatively, you can look at the source code.
Source:stackexchange.com