مشكلة في الاتصال مع قاعدة البيانات failed to connect to server في mongodb

عندما أقوم بتشغيل خادم الويب من خلال nodemon تظهر لدي أخطاء متعلّقة بالاتصال بقاعدة البيانات mongodb:

DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. 
To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

Warning { MongoError: failed to connect to server [mongodb:27017] on first connect
    at Pool.<anonymous> (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/topologies/server.js:325:35)
    at emitOne (events.js:96:13)
    at Pool.emit (events.js:188:7)
    at Connection.<anonymous> (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/connection/pool.js:270:12)
    at Connection.g (events.js:292:16)
    at emitTwo (events.js:106:13)
    at Connection.emit (events.js:191:7)
    at Socket.<anonymous> (/Users/michaelks/Desktop/users/node_modules/mongodb-core/lib/connection/connection.js:173:49)
    at Socket.g (events.js:292:16)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at connectErrorNT (net.js:1025:8)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)
  name: 'MongoError',
  message: 'failed to connect to server [mongodb:27017] on first connect' }

وكود الاتصال بقاعدة البيانات هو التالي:

MongoClient.connect(myURL, { useNewUrlParser: true }, (err, db) => {
    if (err) throw err;
    console.log('connected successfully to the database');
    db.close();
});

ماهو حل هذه المشكلة؟