运行 npm run dev时报错 about for-node HOT 12 CLOSED

> dev
> cross-env NODE_ENV=development nodemon index.js

[nodemon] 2.0.16
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
node:events:505
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 0.0.0.0:6700
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1187:16)
Emitted 'error' event on WebSocket instance at:
    at emitErrorAndClose (/root/node/node_modules/ws/lib/websocket.js:874:13)
    at ClientRequest.<anonymous> (/root/node/node_modules/ws/lib/websocket.js:736:5)
    at ClientRequest.emit (node:events:527:28)
    at Socket.socketErrorListener (node:_http_client:454:9)
    at Socket.emit (node:events:527:28)
    at emitErrorNT (node:internal/streams/destroy:157:8)
    at emitErrorCloseNT (node:internal/streams/destroy:122:3)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '0.0.0.0',
  port: 6700
}

> dev
> cross-env NODE_ENV=development nodemon index.js

[nodemon] 2.0.16
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
node:events:505
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 0.0.0.0:6700
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1187:16)
Emitted 'error' event on WebSocket instance at:
    at emitErrorAndClose (/root/node/node_modules/ws/lib/websocket.js:874:13)
    at ClientRequest.<anonymous> (/root/node/node_modules/ws/lib/websocket.js:736:5)
    at ClientRequest.emit (node:events:527:28)
    at Socket.socketErrorListener (node:_http_client:454:9)
    at Socket.emit (node:events:527:28)
    at emitErrorNT (node:internal/streams/destroy:157:8)
    at emitErrorCloseNT (node:internal/streams/destroy:122:3)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '0.0.0.0',
  port: 6700
}