Failed to connect to Mongo db

if u get this error

MongoDB shell version: 3.0.3
connecting to: test
2015-05-29T23:58:49.450+0200 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2015-05-29T23:58:49.452+0200 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
    at connect (src/mongo/shell/mongo.js:179:14)
    at (connect):1:6 at src/mongo/shell/mongo.js:179
exception: connect failed  

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solve 

1. enter mongod then leave the window (it leaves a message)

2. then in a new window use mongo

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enjoy.........................................