在element UI的使用过程中，出现错误，错误信息为：
error in ./src/components/HelloWorld.vue

Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type.
| <template>
| <div class="hello">
| <el-button>界面</el-button>

@ ./src/router/index.js 3:0-49
@ ./src/main.js
@ multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./src/main.js

error in ./src/App.vue

Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type.
| <template>
| <div id="app">
| <h1>aa</h1>

@ ./src/main.js 4:0-24
@ multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./src/main.js
这是什么原因