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I had the same problem when I made the migration to vuejs 3.
This: import Vue from 'vue';
has to be changed to:
import { createApp } from 'vue'
const app = createApp({})
Take a look to the guide:
https://v3-migration.vuejs.org/breaking-changes/global-api.html#a-new-global-api-createapp
Source:stackexchange.com