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I am new with this vue and I got this error when I try to run (npm run serve):

***WARNING Compiled with 4 warnings
warning in ./src/main.js
"export 'default' (imported as 'Vue') was not found in 'vue'
warning in ./src/main.js
"export 'default' (imported as 'Vue') was not found in 'vue'
warning in ./src/main.js
"export 'default' (imported as 'Vue') was not found in 'vue'
warning in ./src/router/index.js
"export 'default' (imported as 'Vue') was not found in 'vue'
App running at:
Local: http://localhost:8080/
Network: http://10.2.220.30:8080/***
index.js
import Vue from "vue";
import VueRouter from "vue-router";
import Home from "../views/Home.vue";
Vue.use(VueRouter);
const routes = [{
        path: "/home",
        name: "home",
        component: Home,
        meta: {
            requiresAuth: true
        path: "/",
        name: "login",
        component: () =>
            import ("../views/login.vue")
        path: "/register",
        name: "register",
        component: () =>
            import ("../views/register.vue")
const router = new VueRouter({
    mode: "history",
    base: process.env.BASE_URL,
    routes
router.beforeEach((to, from, next) => {
    if (to.matched.some(record => record.meta.requiresAuth)) {
        if (localStorage.getItem("jwt") == null) {
            next({
                path: "/"
        } else {
            next();
    } else {
        next();
export default router;
main.js
import Vue from "vue";
import App from "./App.vue";
import router from "./router";
import axios from "axios";
import "bootstrap/dist/css/bootstrap.css";
const base = axios.create({
    baseURL: "http://localhost:4000"
Vue.prototype.$http = base;
Vue.config.productionTip = false;
new Vue({
    router,
    render: h => h(App)
}).$mount("#app");
                Did you install Vue 2 or Vue 3? Vue recently released 3.0.0, and it has a different syntax for initializing Vue. Which is why you might have issues with the syntax above.
– Hiws
                Sep 24, 2020 at 6:32
                At first it works fine when I run npm run serve..but as I go through in this project I got this error, that's why I install vue using npm but then again I got the same error.
– cypher
                Sep 24, 2020 at 7:02
When you upgrade to vue v3 should upgrade vue-router to 'vue-router/next'
Offical website
and use this code instead to import the function
import { createRouter, createWebHistory } from 'vue-router'
and remove
Vue.use(VueRouter);
Type these commands in the project terminal
npm uninstall vue-router --legacy-peer-deps
npm install --save vue-router@3
It worked in my case the issue was due to vue-router version
https://blog.csdn.net/cxl1191628698/article/details/127352186
        
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