Herokuのデプロイのheroku run rake db:migrateがうまくいきません

git push heroku masterまではうまくいったのですが、heroku run rake db:migrateでname:errorがでてしまいます。

$ heroku run rake db:migrate
Running rake db:migrate on koneqanda... up, run.3523
rake aborted!
NameError: undefined local variable or method config' for main:Object /app/config/application.rb:28:in <top (required)>'
/app/Rakefile:4:in require' /app/Rakefile:4:in <top (required)>'
(See full trace by running task with --trace)
で指摘されてるところを見ると

/app/config/application.rb

require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module KomaQuestion
  class Application < Rails::Application
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    # config.time_zone = 'Central Time (US & Canada)'

    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
    config.i18n.default_locale = :ja

    # Do not swallow errors in after_commit/after_rollback callbacks.
    config.active_record.raise_in_transactional_callbacks = true
  end
end
# for heroku deploy
ここ=> config.assets.initialize_on_precompile = false

となっていてこの部分を消すと今度はgit push heroku masterにエラーがでます。どうしたら良いでしょうか？