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To solve this, you must create a boot file
// /src/boot/echart.js
import { boot } from 'quasar/wrappers';
import VCharts from 'v-charts';
export default boot(({ app, router, store, Vue }) => {
Vue.use(VCharts);
});
Then in quasar.conf.js you will find a key named ‘boot’, which is an array. Add ‘echart’ (same as the file named above) to it.
And now it works!
Source:stackexchange.com