Depending on your application’s configuration some manual setup may be required:

1. Ensure you have defined default url options in your environments files. Here
   is an example of default_url_options appropriate for a development environment
   in config/environments/development.rb:

     config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

   In production, :host should be set to the actual host of your application.

   * Required for all applications. *

2. Ensure you have defined root_url to *something* in your config/routes.rb.
   For example:

     root to: "home#index"

   * Not required for API-only Applications *

3. Ensure you have flash messages in app/views/layouts/application.html.erb.
   For example:

     <p class="notice"><%= notice %></p>
     <p class="alert"><%= alert %></p>

   * Not required for API-only Applications *

4. You can copy Devise views (for customization) to your app by running:

     rails g devise:views

   * Not required *