Vuejs [Vue警告]：渲染错误：“ TypeError：无法读取未定义的属性'smAndDown'”

Question

在将vuetify安装到我的webpack.config.js中后，我在控制台中收到了此消息。而且视图无法正确呈现。

vue.esm.js?a026:628 [Vue warn]: Error in render: "TypeError: Cannot read property 'smAndDown' of undefined"

found in

---> <VToolbar>

webpack.config.js

module.exports.plugins = (module.exports.plugins || []).concat([
   new CopyWebpackPlugin([
       {
           from: path.join(__dirname, './assets'),
           to: path.join(__dirname, 'public/assets')
       }
   ]),
   new webpack.DefinePlugin({
       env: JSON.stringify(env)
   }),
   new VueLoaderPlugin(),
   new VuetifyLoaderPlugin(),
   new HtmlWebpackPlugin({
       hash: true,
       template: "./src/index.html"
   })
]);

babel

{
    "presets": [
        "@babel/preset-env"
    ],
    "plugins": [
        ["@babel/plugin-transform-runtime"]
    ]
}

我想念什么？谢谢