const mongoose = require("mongoose")

mongoose.connect("mongodb://localhost:27017/testdb")

const userSchema = new mongoose.Schema({
    name : String,
    age : Number
})

const User = mongoose.model("User", userSchema);

const user1 = new User({name: "Jack", age: 24});
user1.save().then(() => console.log("User Saved"));

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我试图使用mongoose对mongoDB数据库执行CRUD操作，弹出了这个错误。