getting the events.js:72 throw er; // Unhandled 'error' event when starting server.js

[kodemafia]

user@mediasrvr:~/kurento-tutorial-node/kurento-group-call/example$ node server.js
express-session deprecated undefined resave option; provide resave option server.js:55:9
express-session deprecated undefined saveUninitialized option; provide saveUninitialized option server.js:55:9

events.js:72
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE
at errnoException (net.js:905:11)
at Server._listen2 (net.js:1043:14)
at listen (net.js:1065:10)
at Server.listen (net.js:1139:5)
at EventEmitter.app.listen (/home/user/kurento-tutorial-node/kurento-group-call/example/node_modules/express/lib/application.js:595:24)
at Object. (/home/user/kurento-tutorial-node/kurento-group-call/example/server.js:127:18)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
user@mediasrvr:~/kurento-tutorial-node/kurento-group-call/example$