"webpack-dev-server --content-base build" is failing.

Hi,

I’ve cloned the repo. installed the npm packages but when i try to run “npm start” i get error.

Here is the error message: `

formsy-react@0.17.0 start /Users/hevmag/Projects/test/formsy-react-master webpack-dev-server --content-base build

events.js:141 throw er; // Unhandled ‘error’ event ^

Error: listen EADDRINUSE 127.0.0.1:8080 at Object.exports._errnoException (util.js:870:11) at exports._exceptionWithHostPort (util.js:893:20) at Server._listen2 (net.js:1237:14) at listen (net.js:1273:10) at net.js:1382:9 at GetAddrInfoReqWrap.asyncCallback as callback at GetAddrInfoReqWrap.onlookup as oncomplete

npm ERR! Darwin 15.3.0 npm ERR! argv “/usr/local/bin/node” “/usr/local/bin/npm” “start” npm ERR! node v4.2.6 npm ERR! npm v3.7.1 npm ERR! code ELIFECYCLE npm ERR! formsy-react@0.17.0 start: webpack-dev-server --content-base build npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the formsy-react@0.17.0 start script ‘webpack-dev-server --content-base build’. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the formsy-react package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! webpack-dev-server --content-base build npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs formsy-react npm ERR! Or if that isn’t available, you can get their info via: npm ERR! npm owner ls formsy-react npm ERR! There is likely additional logging output above.`

And the NPM debug log:

Pastebin

[hevar]

I solved it by:

1. Remove the /tmp folder (suggested by @hiro1107 ), or you can simply reboot your computer.
2. rm -rf node_modules (deleten all npm packags)
3. npm cache clean (clearing the cache)
4. npm run start. You can replace start with one of the other scripts (deploy, test, examples and prepublish) depending on what you want to do.

[hiro1107]

I got the same error. I deleted tmp folder and it is now working again. Hope it will help!