Not able to connect with mongodb in Laravel 5.2

In Laravel 5.2, I am trying to connect with mongodb. I have followed the steps mentioned in http://ift.tt/1qxFWF0 . After creating a table in migration when I run the command 'php artisan migrate', I get an error

[MongoConnectionException]
Failed to connect to: localhost:27017: Authentication failed on database 'admin' with username 'admin': auth failed

Could someone help me how to resolve this issue

via Chebli Mohamed