Can't install and use "draper" gem

I have some problems handling draper gem.

install draper gem 'draper'
```
$ bundle install
```

and this was successful.

did rails generate draper:install
```
$ rails generate draper:install
```

but I got some errors

    Expected string default value for '--test-framework'; got false (boolean)
    Expected string default value for '--helper'; got true (boolean)
    Expected string default value for '--assets'; got true (boolean)
    Expected string default value for '--test-framework'; got false (boolean)
    Expected string default value for '--helper'; got true (boolean)
    Expected string default value for '--decorator'; got true (boolean)
    Expected string default value for '--decorator'; got true (boolean)
    Expected string default value for '--jbuilder'; got true (boolean)
    Could not find generator draper:install.

never mind, I did rails generate decorator Service

Expected string default value for '--test-framework'; got false (boolean)
Expected string default value for '--helper'; got true (boolean)
Expected string default value for '--assets'; got true (boolean)
Expected string default value for '--test-framework'; got false (boolean)
Expected string default value for '--helper'; got true (boolean)
Expected string default value for '--decorator'; got true (boolean)
Expected string default value for '--decorator'; got true (boolean)
Expected string default value for '--jbuilder'; got true (boolean)
Expected string default value for '--test-framework'; got false (boolean)
      create  app/decorators/service_decorator.rb

this was successful.

made method in services_decorator

class ServiceDecorator < Draper::Decorator
  delegate_all

  def hello
    'hello'
  end
end

call this method from view
```
<%= Service.first.decorate.hello %>
```

but this was error,

    Could not infer a decorator for ActiveRecord::Base.

Can someone teach me what was wrong and how to solve this problem? The rails version is 4.1.7, and draper version is 2.1.0

Solution

To remove errors while using rails generator change gem thor version to 0.19.1

And try to add to application.rb config.autoload.path += %W(#{config.root}/app/decorators)