我尝试使用Node.js设置MongoDB，但一直收到以下错误：

Uncaught MongooseServerSelectionError MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
    at MongooseError (c:\Users\lilpi\mongo\node_modules\mongoose\lib\error\mongooseError.js:7:1)
    at MongooseServerSelectionError (c:\Users\lilpi\mongo\node_modules\mongoose\lib\error\serverSelection.js:26:1)
    at Connection.openUri (c:\Users\lilpi\mongo\node_modules\mongoose\lib\connection.js:824:32)
    at <anonymous> (c:\Users\lilpi\mongo\node_modules\mongoose\lib\index.js:381:10)
    at <anonymous> (c:\Users\lilpi\mongo\node_modules\mongoose\lib\helpers\promiseOrCallback.js:41:5)
    at promiseOrCallback (c:\Users\lilpi\mongo\node_modules\mongoose\lib\helpers\promiseOrCallback.js:40:10)
    at Mongoose._promiseOrCallback (c:\Users\lilpi\mongo\node_modules\mongoose\lib\index.js:1234:10)
    at Mongoose.connect (c:\Users\lilpi\mongo\node_modules\mongoose\lib\index.js:380:20)
    at <anonymous> (c:\Users\lilpi\mongo\app.js:3:10)
    at Module._compile (internal/modules/cjs/loader:1126:14)
    at Module._extensions..js (internal/modules/cjs/loader:1180:10)
    at Module.load (internal/modules/cjs/loader:1004:32)
    at Module._load (internal/modules/cjs/loader:839:12)
    at executeUserEntryPoint (internal/modules/run_main:81:12)
    at <anonymous> (internal/main/run_main_module:17:47)

下面是我的代码：

const mongoose = require('mongoose')
mongoose.connect('mongodb://localhost:27017/mongotest')

下面是我的数据库连接：

这是我第一次尝试使用MongoDB，我对node.js和整个编程都很陌生，所以解决方案可能非常明显。