npm run dev 报错，不太懂webpack，请大神帮忙解决。

npm run dev

> @1.0.0 dev /Users/atom/Workspace/iview
> webpack-dev-server --content-base ./ --open --inline --hot --compress --history-api-fallback --config webpack.dev.config.js

fs.js:157
throw new ERR_INVALID_CALLBACK();
^

TypeError [ERR_INVALID_CALLBACK]: Callback must be a function
at maybeCallback (fs.js:157:9)
at Object.fs.write (fs.js:674:14)
at /Users/atom/Workspace/iview/webpack.dev.config.js:10:8
at FSReqWrap.oncomplete (fs.js:169:20)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @1.0.0 dev: `webpack-dev-server --content-base ./ --open --inline --hot --compress --history-api-fallback --config webpack.dev.config.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @1.0.0 dev 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! /Users/atom/.npm/_logs/2018-05-29T01_29_12_570Z-debug.log

Start with webpack.dev.config.js at line 10, where the stack trace reports fs.write failing, and reproduce the issue with npm run dev. Check the relevant Node.js fs API usage and confirm that the development server starts without ERR_INVALID_CALLBACK.

Written by the indexing model from the issue text.