webpack-dev-server --inline --progress --config build/webpack.dev.conf.js 报错

运行时报错：

cnpm run dev

> vuejs@1.0.0 dev
> webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

CLI for webpack must be installed.
webpack-cli (https://github.com/webpack/webpack-cli)

We will use "npm" to install the CLI via "npm install -D webpack-cli".
Do you want to install 'webpack-cli' (yes/no):

按y

解决方法：

npm config set registry https://registry.npm.taobao.org
npm install webpack webpack-dev-server -d -g

cnpm install webpack-cli -g

以上也不管用，但安装了webpack ,最后进行了重新安装。