Node.js throws the below "events.js:72 throw er; // Unhandled 'error' even"

I am running one .js script and new to the node.js, I am getting below errors:

2014-08-12 23:24:20.986 UTC - Server running at 10.11.6.249:9090

events.js:72 throw er; // Unhandled 'error' event ^ Error: listen EADDRNOTAVAIL

at errnoException (net.js:904:11)

at Server._listen2 (net.js:1023:19)

at listen (net.js:1064:10)

at net.js:1146:9

at dns.js:72:18

at process._tickCallback (node.js:419:13)

at Function.Module.runMain (module.js:499:11)

at startup (node.js:119:16)

at node.js:906:3

Not sure why these errors are I have closed the port 8000 and re-launch app as well, still facing the same issue.