How to fix "... is not a registered scale" error?
As you can see in migration to v4 guide:
v4 of this library, just like Chart.js v3, is tree-shakable. It means that you need to import and register the controllers, elements, scales, and plugins you want to use.
For a list of all the available items to import, see Chart.js docs.
So you should register missed components. For example, if you have Uncaught Error: "category" is not a registered scale.
error, you should register CategoryScale
:
import { CategoryScale, Chart } from "chart.js";
Chart.register(CategoryScale);