具体报错：

解决步骤：

1. 修改package.json

"dependencies": {
    "@element-plus/icons-vue": "^0.2.4",
    "core-js": "^3.6.5",
    "element-plus": "^1.3.0-beta.5",
    "vue": "^3.2.8",
    "vue-router": "^4.0.11",
    "vuex": "^4.0.2"
  }

2. 删除掉src/plugins/element.js文件中的这一行

import 'element-plus/lib/theme-chalk/index.css'

3. 修改src/views/login/index.vue的引用

import { Avatar } from '@element-plus/icons-vue'

4. 修改src/App.vue文件

<template>
  <router-view />
</template>

<script>
export default {
  name: 'App'
}
</script>

<style></style>

5. 删除node_modules模块然后执行npm install重新安装
6. 依赖安装成功后执行：npm run serve 即可