我在electron内部运行express.js，并且尝试将mongodb composs连接到expressjs
当我使用electron启动express.js时，我在mongodb中得到错误，我已经在mongodb composs中创建了数据库，这里是错误

下面是express.js的代码

const express = require("express");
const mongoose = require("mongoose");
const cors = require("cors");

async function startExpressServer() {
  // Connect to MongoDB
  await mongoose.connect("mongodb://localhost:27017/pos", {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  });
  console.log("Connected to MongoDB");

  const expressApp = express();
  expressApp.use(cors());

  expressApp.get("/", (req, res) => {
    res.send("Hello World from Express!");
  });

  return expressApp;
}

module.exports = { startExpressServer };

在main.js中，我有这段代码，它可以统计我的Express应用程序

app.on("ready", async () => {
  // Start the Express server
  const expressApp = await startExpressServer();
  const port = 3001;
  expressApp.listen(port, () => {
    console.log(`Server listening on port ${port}`);
  });

  createMainWindow();
});

此代码工作，并运行express应用程序之前，我添加monogo db连接