```ruby
# frozen_string_literal: true

module Folio
  class Engine < ::Rails::Engine
    isolate_namespace Folio

    initializer 'errors', before: :load_config_initializers do |app|

      Rails.application.config.exceptions_app = self.routes
    end

    config.to_prepare do
      Devise::SessionsController.layout 'folio/console/devise'
      Devise::ConfirmationsController.layout 'folio/console/devise'
      Devise::UnlocksController.layout 'folio/console/devise'
      Devise::PasswordsController.layout 'folio/console/devise'

      Dir.glob(Rails.root + 'app/decorators/**/*_decorator*.rb').each do |c|
        require_dependency(c)
      end
    end

    config.generators do |g|
      g.stylesheets false
      g.javascripts false
      g.helper false
    end

    begin
      config.autoload_paths << self.root.join('lib')
      config.eager_load_paths << self.root.join('lib')
      config.assets.paths << self.root.join('app/cells')
      config.assets.paths << self.root.join('vendor/assets/bower_components')
    rescue RuntimeError
    end

    initializer :append_migrations do |app|
      unless app.root.to_s.match root.to_s
        config.paths['db/migrate'].expanded.each do |expanded_path|
          app.config.paths['db/migrate'] << expanded_path
        end
      end
    end
  end
end
```

Revert "fix duplicate loading of frozen config array"
user
```ruby
# frozen_string_literal: true

module Folio
  class Engine < ::Rails::Engine
    isolate_namespace Folio

    initializer 'errors', before: :load_config_initializers do |app|

      Rails.application.config.exceptions_app = self.routes
    end

    config.to_prepare do
      Devise::SessionsController.layout 'folio/console/devise'
      Devise::ConfirmationsController.layout 'folio/console/devise'
      Devise::UnlocksController.layout 'folio/console/devise'
      Devise::PasswordsController.layout 'folio/console/devise'

      Dir.glob(Rails.root + 'app/decorators/**/*_decorator*.rb').each do |c|
        require_dependency(c)
      end
    end

    config.generators do |g|
      g.stylesheets false
      g.javascripts false
      g.helper false
    end

    config.autoload_paths << self.root.join('lib')
    config.eager_load_paths << self.root.join('lib')
    config.assets.paths << self.root.join('app/cells')
    config.assets.paths << self.root.join('vendor/assets/bower_components')

    initializer :append_migrations do |app|
      unless app.root.to_s.match root.to_s
        config.paths['db/migrate'].expanded.each do |expanded_path|
          app.config.paths['db/migrate'] << expanded_path
        end
      end
    end
  end
end
```
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