MongoDB Error: couldn't connect to server 127.0.0.1:27017 exception: connect failed | mongoDB

#SimpleSnipCode
MongoDB shell version v5.0.2
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
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:372:17
@(connect):2:6
exception: connect failed
exiting with code 1

Error: couldn’t connect to server 127.0.0.1:27017, connection attempt failed: