Error at npm run

[Mohamed Aboelmagd]

npm start

angular1-webpack-starter@0.5.0 start /home/Desktop/github/angular1-webpack-starter
webpack-dev-server --mock

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

Error: listen EADDRINUSE 0.0.0.0:8080
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 nextTickCallbackWith3Args (node.js:452:9)
at process._tickCallback (node.js:358:17)
at Function.Module.runMain (module.js:444:11)
at startup (node.js:136:18)
at node.js:966:3

npm ERR! Linux 4.8.0-51-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! angular1-webpack-starter@0.5.0 start: webpack-dev-server --mock
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the angular1-webpack-starter@0.5.0 start script 'webpack-dev-server --mock'.
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 angular1-webpack-starter package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! webpack-dev-server --mock
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs angular1-webpack-starter
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls angular1-webpack-starter
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /home/Desktop/github/angular1-webpack-starter/npm-debug.log

[Wenbo Jie]

As the error indicates, Error: listen EADDRINUSE 0.0.0.0:8080 means your 8080 port is in use