Senín ( con n )

Estoy usando Paperclip para asociar adjuntos y al generar el modelo casca este error :

$ rails generate paperclip pet photo
/var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require': cannot load such file -- cocaine (LoadError)
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `block in require'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `block in load_dependency'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:640:in `new_constants_in'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `load_dependency'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require'
    from /home/jorge/Proyects/Clientes/elcielodelosgatos/vendor/plugins/paperclip/lib/paperclip.rb:45:in `'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `block in require'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `block in load_dependency'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:640:in `new_constants_in'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:223:in `load_dependency'
    from /var/lib/gems/1.9.1/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require'
    from /home/jorge/Proyects/Clientes/elcielodelosgatos/vendor/plugins/paperclip/init.rb:1:in `block in '
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/plugin.rb:81:in `eval'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/plugin.rb:81:in `block in '
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:30:in `instance_exec'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:30:in `run'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:54:in `each'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/initializable.rb:54:in `run_initializers'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/application.rb:96:in `initialize!'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/application.rb:83:in `require'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/application.rb:83:in `require_environment!'
    from /var/lib/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:22:in `'
    from script/rails:6:in `require'
    from script/rails:6:in `
'

Para solucionarlo, hay que instalar la gema cocaine ( A small library for doing (command) lines )

gem install cocaine

Sige apareciendo el error así que hay que agregarlo a Gemfile

echo "gem 'cocaine'" >> Gemfile

y ya funciona.

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