在vue cli3.0 里面下载less，下载成功了还是提示没有 需要下载

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今天正好新建了一个项目，在用less的时候就各种花样报错提示我：

Failed to resolve loader: less-loader
You may need to install it.
Error from chokidar (C:\): Error: EBUSY: resource busy or locked, lstat 'C:\hiberfil.sys'
Error from chokidar (C:\): Error: EBUSY: resource busy or locked, lstat 'C:\pagefile.sys'
Error from chokidar (C:\): Error: EBUSY: resource busy or locked, lstat 'C:\swapfile.sys'

​编辑

Failed to resolve loader: less-loader
You may need to install it.

​编辑

Error: Cannot find module 'less'

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解决办法：npm install less --save-dev

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