为什么我在启动 my_app 服务器时收到此错误消息

Question

node:events:304
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::3000
    at Server.setupListenHandle [as _listen2] (node:net:1286:16)
    at listenInCluster (node:net:1334:12)
    at Server.listen (node:net:1420:7)
    at Function.listen (/home/abubakar/Desktop/Node/express/node_modules/express/lib/application.js:618:24)
    at Object.<anonymous> (/home/abubakar/Desktop/Node/express/my_app.js:24:5)
    at Module._compile (node:internal/modules/cjs/loader:1083:30)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1112:10)
    at Module.load (node:internal/modules/cjs/loader:948:32)
    at Function.Module._load (node:internal/modules/cjs/loader:789:14)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:72:12)
Emitted 'error' event on Server instance at:
    at emitErrorNT (node:net:1313:8)
    at processTicksAndRejections (node:internal/process/task_queues:80:21) {
  code: 'EADDRINUSE',
  errno: -98,
  syscall: 'listen',
  address: '::',
  port: 3000
}
[nodemon] app crashed - waiting for file changes before starting...

Answer 1

错误：监听 EADDRINUSE 即将到来，因为您的端口 3000 正在被另一个实例或应用程序使用。终止该应用程序或将您的端口更改为不同的值，如 3001 或 3002。

Answer 2

打开任务管理器并检查是否有任何应用程序正在使用3000端口。 终止该进程，然后运行该应用程序。 如果那不可行，请重新启动系统。