FATAL: o papel "raiz" não existe

Comecei a aprender usando o heroku e estava tentando executarbundle exec rake db:create db:migrate comando, eu encontrei os seguintes erros,

FATAL:  role "root" does not exist
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:898:in `rescue in connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:568:in `initialize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `new'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:87:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/postgresql_database_tasks.rb:8:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/postgresql_database_tasks.rb:17:in `create'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:88:in `create'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:102:in `block in create_current'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:225:in `block in each_current_configuration'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:224:in `each'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:224:in `each_current_configuration'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:101:in `create_current'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:240:in `call'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:240:in `block in execute'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:235:in `each'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:235:in `execute'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:165:in `invoke'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:156:in `invoke_task'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `block (2 levels) in top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `each'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `block in top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:121:in `run_with_threads'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:106:in `top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:84:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:182:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:79:in `run'
/var/lib/gems/1.9.1/gems/rake-10.4.0/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "database"=>"root"}
FATAL:  role "root" does not exist
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:898:in `rescue in connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:568:in `initialize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `new'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:87:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/postgresql_database_tasks.rb:8:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/postgresql_database_tasks.rb:17:in `create'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:88:in `create'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:102:in `block in create_current'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:225:in `block in each_current_configuration'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:224:in `each'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:224:in `each_current_configuration'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/tasks/database_tasks.rb:101:in `create_current'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:240:in `call'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:240:in `block in execute'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:235:in `each'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:235:in `execute'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/task.rb:165:in `invoke'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:156:in `invoke_task'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `block (2 levels) in top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `each'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:112:in `block in top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:121:in `run_with_threads'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:106:in `top_level'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:84:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:182:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.4.0/lib/rake/application.rb:79:in `run'
/var/lib/gems/1.9.1/gems/rake-10.4.0/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "database"=>"ruby-getting-started_test"}
rake aborted!
ActiveRecord::NoDatabaseError: FATAL:  role "root" does not exist
Run `$ bin/rake db:create db:migrate` to create your database
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:898:in `rescue in connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `connect'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:568:in `initialize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `new'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/connection_handling.rb:87:in `connection'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/migration.rb:909:in `initialize'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/migration.rb:807:in `new'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/migration.rb:807:in `up'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/migration.rb:785:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.1.8/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

Eu tentei editar o arquivo schema.rb, mas é inútil. Estou desenvolvendo isso no Ubuntu, indique onde estou errado

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