Rails - Jul 2014 - heroku push Mongo::ConnectionFailure: Failed to connect to a master node at 127.0.0.1:27017

Hi.my problem is Mongo::ConnectionFailure: Failed to connect to a master 
node at 127.0.0.1:27017 when im pushing on heroku

im using mongomapper

defaults: &defaults host: 127.0.0.1 port: 27017 options: w: 1 pool_size: 1 
slave_ok: false ssl: false

development: <<: *defaults database: devname

test: <<: *defaults database: testname w: 0

production: <<: *defaults

database: devname

MongoMapper.connection = Mongo::Connection.new('localhost', 27017)

MongoMapper.database = "appname-#{Rails.env}"

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