title: node:events:505 throw er; // Unhandled 'error' event Error: listen EACCES: permission denied 4000;
body: <p>node:events:505
  throw er; // Unhandled 'error' event
  ^</p>
  <p>Error: listen EACCES: permission denied 4000;
  at Server.setupListenHandle [as _listen2] (node:net:1363:21)
  at listenInCluster (node:net:1428:12)
  at Server.listen (node:net:1527:5)
  at Function.listen (D:\REACT JS\E-COMMERCE\node_modules\express\lib\application.js:635:24)
  at Object. (D:\REACT JS\E-COMMERCE\backend\server.js:10:5)
  at Module._compile (node:internal/modules/cjs/loader:1099:14)
  at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
  at Module.load (node:internal/modules/cjs/loader:975:32)
  at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
  Emitted 'error' event on Server instance at:
  at emitErrorNT (node:net:1407:8)
  at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  errno: -4092,
  syscall: 'listen',
  address: '4000;',
  port: -1
  }</p>