안녕하세요 강의대로 진행하고 공부하고 있는데 다음과 같은 오류가 발생합니다. 어떻게 조치하면 좋을까요?

버전을 오히려 낮춰서 해보고 있는데 터미널 창에선 오류가 발생하지 않지만, 개발자도구에서 확인할 때 다음과 같은 오류가 발생합니다.간단한 라우팅 부분인데도 시간이 너무 오래걸려서... 힘듭니다 ㅠ 확인해주세요 Vue warn]: Error in beforeCreate hook: "TypeError: this._router.init is not a function"(found in )warn @ vue.runtime.esm.js:4605logError @ vue.runtime.esm.js:3045globalHandleError @ vue.runtime.esm.js:3041handleError @ vue.runtime.esm.js:3008invokeWithErrorHandling @ vue.runtime.esm.js:3024callHook$1 @ vue.runtime.esm.js:4031Vue._init @ vue.runtime.esm.js:5689Vue @ vue.runtime.esm.js:5762eval @ main.js:9./src/main.js @ app.js:276__webpack_require__ @ app.js:348(anonymous) @ app.js:1470__webpack_require__.O @ app.js:394(anonymous) @ app.js:1471(anonymous) @ app.js:1473vue.runtime.esm.js:3049 TypeError: this._router.init is not a function at Vue.beforeCreate (vue-router.esm.js:1298:1) at invokeWithErrorHandling (vue.runtime.esm.js:3017:1) at callHook$1 (vue.runtime.esm.js:4031:1) at Vue._init (vue.runtime.esm.js:5689:1) at new Vue (vue.runtime.esm.js:5762:1) at eval (main.js:9:1) at ./src/main.js (app.js:276:1) at __webpack_require__ (app.js:348:33) at app.js:1470:109 at __webpack_require__.O (app.js:394:23)logError @ vue.runtime.esm.js:3049globalHandleError @ vue.runtime.esm.js:3041handleError @ vue.runtime.esm.js:3008invokeWithErrorHandling @ vue.runtime.esm.js:3024callHook$1 @ vue.runtime.esm.js:4031Vue._init @ vue.runtime.esm.js:5689Vue @ vue.runtime.esm.js:5762eval @ main.js:9./src/main.js @ app.js:276__webpack_require__ @ app.js:348(anonymous) @ app.js:1470__webpack_require__.O @ app.js:394(anonymous) @ app.js:1471(anonymous) @ app.js:1473vue.runtime.esm.js:4605 [Vue warn]: Error in render: "TypeError: Cannot read properties of undefined (reading 'matched')"found in---> at src/App.vue warn @ vue.runtime.esm.js:4605logError @ vue.runtime.esm.js:3045globalHandleError @ vue.runtime.esm.js:3041handleError @ vue.runtime.esm.js:3008Vue._render @ vue.runtime.esm.js:2687updateComponent @ vue.runtime.esm.js:3875Watcher.get @ vue.runtime.esm.js:3446Watcher @ vue.runtime.esm.js:3436mountComponent @ vue.runtime.esm.js:3892Vue.$mount @ vue.runtime.esm.js:8772init @ vue.runtime.esm.js:4407createComponent @ vue.runtime.esm.js:6567createElm @ vue.runtime.esm.js:6521patch @ vue.runtime.esm.js:7109Vue._update @ vue.runtime.esm.js:3765updateComponent @ vue.runtime.esm.js:3875Watcher.get @ vue.runtime.esm.js:3446Watcher @ vue.runtime.esm.js:3436mountComponent @ vue.runtime.esm.js:3892Vue.$mount @ vue.runtime.esm.js:8772eval @ main.js:12./src/main.js @ app.js:276__webpack_require__ @ app.js:348(anonymous) @ app.js:1470__webpack_require__.O @ app.js:394(anonymous) @ app.js:1471(anonymous) @ app.js:1473vue.runtime.esm.js:3049 TypeError: Cannot read properties of undefined (reading 'matched') at render (vue-router.esm.js:354:1) at createFunctionalComponent (vue.runtime.esm.js:4357:1) at createComponent (vue.runtime.esm.js:4497:1) at _createElement (vue.runtime.esm.js:2916:1) at createElement$1 (vue.runtime.esm.js:2866:1) at vm._c (vue.runtime.esm.js:2635:1) at Proxy.render (App.vue:11:1) at Vue._render (vue.runtime.esm.js:2684:1) at VueComponent.updateComponent (vue.runtime.esm.js:3875:1) at Watcher.get (vue.runtime.esm.js:3446:1)logError @ vue.runtime.esm.js:3049globalHandleError @ vue.runtime.esm.js:3041handleError @ vue.runtime.esm.js:3008Vue._render @ vue.runtime.esm.js:2687updateComponent @ vue.runtime.esm.js:3875Watcher.get @ vue.runtime.esm.js:3446Watcher @ vue.runtime.esm.js:3436mountComponent @ vue.runtime.esm.js:3892Vue.$mount @ vue.runtime.esm.js:8772init @ vue.runtime.esm.js:4407createComponent @ vue.runtime.esm.js:6567createElm @ vue.runtime.esm.js:6521patch @ vue.runtime.esm.js:7109Vue._update @ vue.runtime.esm.js:3765updateComponent @ vue.runtime.esm.js:3875Watcher.get @ vue.runtime.esm.js:3446Watcher @ vue.runtime.esm.js:3436mountComponent @ vue.runtime.esm.js:3892Vue.$mount @ vue.runtime.esm.js:8772eval @ main.js:12./src/main.js @ app.js:276__webpack_require__ @ app.js:348(anonymous) @ app.js:1470__webpack_require__.O @ app.js:394(anonymous) @ app.js:1471(anonymous) @ app.js:1473 [package.json]{ "name": "front", "version": "0.1.0", "private": true, "scripts": { "serve": "vue-cli-service serve", "build": "vue-cli-service build", "lint": "vue-cli-service lint" }, "dependencies": { "core-js": "^3.8.3", "vue": "^2.6.14", "vue-router": "^3.5.3", "vuex": "^3.6.2" }, "devDependencies": { "@babel/core": "^7.12.16", "@babel/eslint-parser": "^7.12.16", "@vue/cli-plugin-babel": "~5.0.0", "@vue/cli-plugin-eslint": "~5.0.0", "@vue/cli-service": "~5.0.0", "eslint": "^7.32.0", "eslint-plugin-vue": "^8.0.3", "vue-template-compiler": "^2.6.14" }, "eslintConfig": { "root": true, "env": { "node": true }, "extends": [ "plugin:vue/essential", "eslint:recommended" ], "parserOptions": { "parser": "@babel/eslint-parser" }, "rules": {} }, "browserslist": [ "> 1%", "last 2 versions", "not dead" ] }