ERROR in Entry module not found: Error: Can't resolve './src' in '...'

Insufficient number of arguments or no entry found.

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

Hash: 524609c9e3faeade8d70

Version: webpack 4.18.0

Time: 49ms

Built at: 2018-10-15 09:40:40

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 './src' in '/Users/pangd/Documents/WebProjects/WebpackStudy'