How to display the chart of the chartjs.org plugin?

Question

JavaScript

I want to make a diagram of this kind:

It seems that I added everything that is needed from the documentation, but it simply does not exist. What's wrong with the code?
Link to code: https://codepen.io/Alexei_87/pen/xxVwOGW?editors=1010
Link to doc: https://www.chartjs.org/docs/latest/charts/doughnu...

Answer 1

It's hard to say without seeing the whole code, but there is an assumption that I forgot

<canvas id="myChart" width="400" height="400"></canvas>