Redmine

I receive the following error when I run heroku run rake db:create (bundle install finished correctly without errors):

Running 'rake db:create' attached to terminal... up, run.6027
    Could not find gem 'pg (>= 0.11.0) ruby' in the gems available on this machine.
    Run bundle install to install missing gems.

In the config/database.yml I'm using the default mysql2 database:

production:
      adapter: mysql2
      database: redmine
      host: localhost
      ...
    development:
      adapter: mysql2
      ...
    test:
      adapter: mysql2
      ...

So I guess 'pg (>= 0.11.0) ruby' does not need to be installed. Am I wrong?

On the other hand, Gemfile has the following code:

adapters.each do |adapter|
      case adapter
      when 'mysql2'
        gem "mysql2", "~> 0.3.11", :platforms => [:mri, :mingw]
        gem "activerecord-jdbcmysql-adapter", :platforms => :jruby
      ...
      when /postgresql/
        gem "pg", ">= 0.11.0", :platforms => [:mri, :mingw]
        gem "activerecord-jdbcpostgresql-adapter", :platforms => :jruby
      ...

So again, I guess it should never enter in when /postgresql/ when the command heroku run rake db:create is executed. Am I right?

I'm using Windows XP. It is the first time I use Ruby.