npm run dev报错，events.js:160 throw er; // Unhandled 'error' event

小项目安装webpack，终于到最后了，但是npm run dev还是报错，气死我了，报错如下：

lingling@▒▒▒▒▒▒ MINGW64 /d/wamp3/wamp/www/vue/8/vue-loader-demo
$ npm run dev

> vue-loader-demo@1.0.0 dev D:\wamp3\wamp\www\vue\8\vue-loader-demo
> webpack-dev-server --inline --hot --port 8082

events.js:160
throw er; // Unhandled 'error' event
^

Error: listen EADDRINUSE 127.0.0.1:8082
at Object.exports._errnoException (util.js:1022:11)
at exports._exceptionWithHostPort (util.js:1045:20)
at Server._listen2 (net.js:1262:14)
at listen (net.js:1298:10)
at doListening (net.js:1397:7)
at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10)

npm ERR! Windows_NT 10.0.14393
npm ERR! argv "D:\\nodejs\\node.exe" "d:\\nodejs\\node_global\\node_modules\\npm\\bin\\npm-cli.js" "run" "dev"
npm ERR! node v7.4.0
npm ERR! npm v4.1.1
npm ERR! code ELIFECYCLE
npm ERR! vue-loader-demo@1.0.0 dev: `webpack-dev-server --inline --hot --port 8082`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vue-loader-demo@1.0.0 dev script 'webpack-dev-server --inline --hot --port 8082'.
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 vue-loader-demo package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! webpack-dev-server --inline --hot --port 8082
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs vue-loader-demo
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls vue-loader-demo
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! D:\wamp3\wamp\www\vue\8\vue-loader-demo\npm-debug.log

大家都想不到原因，我也想不到原因，竟然是因为nodejs版本太高了，我从7降到6，就好了。