Vue.js vue webpack 模板缺少解析器

我刚刚用网页模板设置了一个vue项目，如这里所述:http://vuejs-templates.github.io/webpack/

然而，在运行npm run dev只是为了测试模板是否正常工作之后，我出现了以下错误:

Failed to compile with 2 errors                                                                                                                                                                                                                                                           21:49:02
 error  in ./src/App.vue

Module build failed: Error: No parser and no file path given, couldn't infer a parser.
    at normalize (path\node_modules\prettier\index.js:7051:13)
    at formatWithCursor (path\node_modules\prettier\index.js:10370:12)
    at path\node_modules\prettier\index.js:31115:15
    at Object.format (path\node_modules\prettier\index.js:31134:12)
    at Object.module.exports (path\node_modules\vue-loader\lib\template-compiler\index.js:80:23)

 @ ./src/App.vue 11:0-354
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://localhost:8080 webpack/hot/dev-server ./src/main.js

 error  in ./src/components/HelloWorld.vue

Module build failed: Error: No parser and no file path given, couldn't infer a parser.
    at normalize (path\node_modules\prettier\index.js:7051:13)
    at formatWithCursor (path\node_modules\prettier\index.js:10370:12)
    at path\node_modules\prettier\index.js:31115:15
    at Object.format (path\node_modules\prettier\index.js:31134:12)
    at Object.module.exports (path\node_modules\vue-loader\lib\template-compiler\index.js:80:23)

我做错了什么？