FATAL: role “root” does not exist

Question

I have started to learn using heroku and i was trying to execute bundle exec rake db:create db:migrate command, i have encountered the following errors,

Answer 1

When you add the Heroku Postgres add-on (or simply push a rails app to Heroku, and a dev one is added for you), a database is created for you.

Do not fun db:create on Heroku Postgres, it's already created. You can skip to db:migrate, et. al