i am very new to nodejs when i tried to run my first js file having following content
var http = require("http");
http.createServer(function (request, response) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello World\n');
}).listen(8081);
console.log('Server running at http://127.0.0.1:8081/');
with the command
$ node fullpath/filename.js
i am getting error thrown like below

Can anyone tell what is wrong. I am using nodejs appliction window