Throw er; Unhandled ' ERROR ' event

The following error is prompted when starting the service:

events.js:72        throw er; // unhandled  ' ERROR '  event              ^Error:  listen eaddrinuse    at errnoexception  (net.js:904:11)      at Server._listen2  (net.js:1042:14)     at listen  (net.js:1064:10 )     at Server.listen  (Net.js:1138:5)     at  object.start  (/users/yao/mywork/myproject/node_js/lesson3/server.js:13:31)     at  Object.<anonymous>  (/users/yao/mywork/myproject/node_js/lesson3/index.js:10:8)      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) 

After investigation, it was found that another service was started with the same port. Workaround, change the port number or stop the previous service.

Throw er; Unhandled ' ERROR ' event