vue中style-loader,css-loader加载器装不上，为什么?

npm run dev 报错内容如下：

ERROR in ./src/css/index.css 1:3
Module parse failed: Unexpected token (1:3)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders> li {
|     list-style: none;
| }
 @ ./src/main.js 2:0-25

cnpm i style-loader css-loader -D安装加载器内容如下：

 √ Installed 2 packages
√ Linked 0 latest versions
√ Run 0 scripts
√ All packages installed (used 327ms(network 323ms), speed 49.79kB/s, json 2(16.08kB), tarball 0B)
PS D:\phpstudy_pro\U\webpack>

我想问一下是不是加载器没装上，为什么安装不上

你要不要试下用npm来安装，或者把包给删了，再重装一次依赖