我在使用MongoClient连接到mongoDB时遇到了一些问题。

const { MnogoClient , ObjectID} = require('mongodb')
const id = new ObjectID()
console.log(id)

const connectionURL = 'mongodb://127.0.0.1:27017'
const databaseName = 'task-manager'
MnogoClient.connect(connectionURL , {useNewUrlParser: true}, (error, client)=>{
if(error){
    return console.log(error)
}

const db = client.db(databaseName)
//insertOne is asyncronuse opration and beacuse we use callback function 

//for the collection we can assign my own property object id
db.collection('users').insertOne({
    _id: id,
    name: 'Mahdi',
    age: 24
} , (error , result)=>{
    if(error){
        return console.log('Unable to insert the document')
    }
    console.log(result.ops)
    
})})

字符串
TypeError：Cannot read properties of undefined（阅读“连接”）.