throw er; // Unhandled 'error' event while update code

[ngsteel]

hotnode  index.js has been changed
hotnode  node process restarted

events.js:167
throw er; // Unhandled 'error' event
^

Error: listen EADDRINUSE :::8081
at Server.setupListenHandle [as _listen2] (net.js:1286:14)
at listenInCluster (net.js:1334:12)
at Server.listen (net.js:1421:7)
at Function.listen (E:\testCode\ssr\node_modules_express@4.16.4@express\lib\application.js:618:24)
at Object. (E:\testCode\ssr\src\serve\index.js:31:8)
at Module._compile (internal/modules/cjs/loader.js:688:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
at Module.load (internal/modules/cjs/loader.js:598:32)
at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
at Function.Module._load (internal/modules/cjs/loader.js:529:3)
Emitted 'error' event at:
at emitErrorNT (net.js:1313:8)
at process._tickCallback (internal/process/next_tick.js:63:19)
at Function.Module.runMain (internal/modules/cjs/loader.js:744:11)
at startup (internal/bootstrap/node.js:285:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:739:3)