Express.js - Error: listen EADDRINUSE: address already in use :::8080

Working with Express.js application, suddenly I got the following error. Can you help me to fix this?

Stack trace:

node:events:491
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::8080
    at Server.setupListenHandle [as _listen2] (node:net:1432:16)
    at listenInCluster (node:net:1480:12)
    at Server.listen (node:net:1568:7)
    at Function.listen (C:\Users\user\my-project\backend\node_modules\express\lib\application.js:635:24)
    at Object.<anonymous> (C:\Users\user\my-project\backend\index.js:75:5)
    at Module._compile (node:internal/modules/cjs/loader:1126:14)        
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
    at Module.load (node:internal/modules/cjs/loader:1004:32)
    at Function.Module._load (node:internal/modules/cjs/loader:839:12)   
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
Emitted 'error' event on Server instance at:
    at emitErrorNT (node:net:1459:8)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  code: 'EADDRINUSE',
  errno: -4091,
  syscall: 'listen',
  address: '::',
  port: 8080
}