I just started learning MongoDB. When I run for the first time, I get an error.
MongoDB 4 version
Windows 10 x64

MongoDB shell version v4.0.1
connecting to: mongodb://127.0.0.1:27017
2018-08-13T00:15:54.149+0300 E QUERY [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: No connection could be made because the target machine actively refused it. :
connect@src/mongo/shell/mongo.js:257:13
@(connect):1:6
exception: connect failed