akash@akash-PC:~/Documents/node/practice$ node testServer.js
events.js:183 throw er; // Unhandled 'error' event ^
Error: listen EADDRINUSE 127.0.0.1:9000 at Object._errnoException (util.js:1022:11) at _exceptionWithHostPort (util.js:1044:20) at Server.setupListenHandle [as _listen2] (net.js:1351:14) at listenInCluster (net.js:1392:12) at doListen (net.js:1501:7) at _combinedTickCallback (internal/process/next_tick.js:141:11) at process._tickCallback (internal/process/next_tick.js:180:9) at Function.Module.runMain (module.js:686:11) at startup (bootstrap_node.js:187:16) at bootstrap_node.js:608:3