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我刚刚创建了我的节点js服务器，当我指定模式和模型并将其添加到主服务器文件中时，它显示以下错误：

E:\py\.vscode\mern stack\backend\node_modules\mongoose\lib\model.js:115
    throw new TypeError('2nd argument to `Model` must be a POJO or string, ' +
    ^

TypeError: 2nd argument to `Model` must be a POJO or string, **not** a schema. Make sure you're calling `mongoose.model()`, not `mongoose.Model()`.
    at Mongoose.Model (E:\py\.vscode\mern stack\backend\node_modules\mongoose\lib\model.js:115:11)
    at Object.<anonymous> (E:\py\.vscode\mern stack\backend\user.js:7:27)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (E:\py\.vscode\mern stack\backend\server.js:2:14)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)

模式和模型的代码如下：

const mongoose = require('mongoose');
const userSchema = new mongoose.Schema({
    name: String,
    email: String,
    password: String
})
module.exports = mongoose.Model('USER', userSchema);