error

$ npm run start

> @ start /Users/aleks/GitHub/postcss.org
> babel-node scripts/build --server --dev --open

[12:51:31 PM] [statinamic/lib/builder] {
[12:51:31 PM] [statinamic/lib/builder]   "dev": true,
[12:51:31 PM] [statinamic/lib/builder]   "prod": false,
[12:51:31 PM] [statinamic/lib/builder]   "static": false,
[12:51:31 PM] [statinamic/lib/builder]   "server": true,
[12:51:31 PM] [statinamic/lib/builder]   "_": [
[12:51:31 PM] [statinamic/lib/builder]     "node",
[12:51:31 PM] [statinamic/lib/builder]     "/Users/aleks/GitHub/postcss.org/scripts/build"
[12:51:31 PM] [statinamic/lib/builder]   ],
[12:51:31 PM] [statinamic/lib/builder]   "open": true,
[12:51:31 PM] [statinamic/lib/builder]   "consts": {
[12:51:31 PM] [statinamic/lib/builder]     "__DEV__": true,
[12:51:31 PM] [statinamic/lib/builder]     "__PROD__": false,
[12:51:31 PM] [statinamic/lib/builder]     "__STATIC__": false,
[12:51:31 PM] [statinamic/lib/builder]     "__SERVER__": true,
[12:51:31 PM] [statinamic/lib/builder]     "__DEVTOOLS__": false,
[12:51:31 PM] [statinamic/lib/builder]     "__BASE_URL__": {
[12:51:31 PM] [statinamic/lib/builder]       "protocol": "http:",
[12:51:31 PM] [statinamic/lib/builder]       "slashes": true,
[12:51:31 PM] [statinamic/lib/builder]       "auth": null,
[12:51:31 PM] [statinamic/lib/builder]       "host": "0.0.0.0:3000",
[12:51:31 PM] [statinamic/lib/builder]       "port": "3000",
[12:51:31 PM] [statinamic/lib/builder]       "hostname": "0.0.0.0",
[12:51:31 PM] [statinamic/lib/builder]       "hash": null,
[12:51:31 PM] [statinamic/lib/builder]       "search": null,
[12:51:31 PM] [statinamic/lib/builder]       "query": null,
[12:51:31 PM] [statinamic/lib/builder]       "pathname": "/",
[12:51:31 PM] [statinamic/lib/builder]       "path": "/",
[12:51:31 PM] [statinamic/lib/builder]       "href": "http://0.0.0.0:3000/"
[12:51:31 PM] [statinamic/lib/builder]     }
[12:51:31 PM] [statinamic/lib/builder]   },
[12:51:31 PM] [statinamic/lib/builder]   "baseUrl": {
[12:51:31 PM] [statinamic/lib/builder]     "protocol": "http:",
[12:51:31 PM] [statinamic/lib/builder]     "slashes": true,
[12:51:31 PM] [statinamic/lib/builder]     "auth": null,
[12:51:31 PM] [statinamic/lib/builder]     "host": "0.0.0.0:3000",
[12:51:31 PM] [statinamic/lib/builder]     "port": "3000",
[12:51:31 PM] [statinamic/lib/builder]     "hostname": "0.0.0.0",
[12:51:31 PM] [statinamic/lib/builder]     "hash": null,
[12:51:31 PM] [statinamic/lib/builder]     "search": null,
[12:51:31 PM] [statinamic/lib/builder]     "query": null,
[12:51:31 PM] [statinamic/lib/builder]     "pathname": "/",
[12:51:31 PM] [statinamic/lib/builder]     "path": "/",
[12:51:31 PM] [statinamic/lib/builder]     "href": "http://0.0.0.0:3000/"
[12:51:31 PM] [statinamic/lib/builder]   }
[12:51:31 PM] [statinamic/lib/builder] }
events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE 0.0.0.0:3000
    at Object.exports._errnoException (util.js:855:11)
    at exports._exceptionWithHostPort (util.js:878:20)
    at Server._listen2 (net.js:1237:14)
    at listen (net.js:1273:10)
    at net.js:1382:9
    at nextTickCallbackWith3Args (node.js:466:9)
    at process._tickDomainCallback (node.js:413:17)
    at Function.Module.runMain (module.js:432:11)
    at Object.<anonymous> (/Users/aleks/GitHub/postcss.org/node_modules/babel/lib/_babel-node.js:144:25)
    at Module._compile (module.js:398:26)

npm ERR! Darwin 15.3.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "start"
npm ERR! node v5.3.0
npm ERR! npm  v3.5.3
npm ERR! code ELIFECYCLE
npm ERR! @ start: `babel-node scripts/build --server --dev --open`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ start script 'babel-node scripts/build --server --dev --open'.
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  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     babel-node scripts/build --server --dev --open
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/aleks/GitHub/postcss.org/npm-debug.log