npm run build 错误

> tudolist-vue2.0@1.0.0 build C:\Users\Administrator\Desktop\learn\code\tudolist-vue2.0

> webpack --config webpack.config.js

Insufficient number of arguments or no entry found.

Alternatively, run 'webpack(-cli) --help' for usage info.

Hash: 2fec1d82e4d44391aee7

Version: webpack 4.12.0

Time: 101ms

Built at: 2018-06-22 14:39:20

WARNING in configuration

The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.

You can also set it to 'none' to disable any default behavior. Learn more: https://webpack.js.org/concepts/mode/

ERROR in Entry module not found: Error: Can't resolve 'C:\Users\Administrator\Desktop\learn\code\tudolist-vue2.0\src\index.js' in 'C:\Users\Administrator\Desktop\learn\code\tudolist-vue2.0'

npm ERR! code ELIFECYCLE

npm ERR! errno 2

npm ERR! tudolist-vue2.0@1.0.0 build: `webpack --config webpack.config.js`

npm ERR! Exit status 2

npm ERR!

npm ERR! Failed at the tudolist-vue2.0@1.0.0 build script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2018-06-22T06_39_21_001Z-debug.log