rails guide problem

gistfile1.txt

sirene@cleopatra:~/Escritorio/rails-master$  cd guides
sirene@cleopatra:~/Escritorio/rails-master/guides$ ls
assets  bug_report_templates  CHANGELOG.md  rails_guides  rails_guides.rb  Rakefile  source  w3c_validator.rb
sirene@cleopatra:~/Escritorio/rails-master/guides$ rake guides:generate:html
/usr/local/bin/ruby rails_guides.rb
/home/sirene/Escritorio/rails-master/actionpack/lib/action_controller/metal/strong_parameters.rb:528:in `<class:Parameters>': cannot load such file -- rack/test (LoadError)
	from /home/sirene/Escritorio/rails-master/actionpack/lib/action_controller/metal/strong_parameters.rb:106:in `<module:ActionController>'
	from /home/sirene/Escritorio/rails-master/actionpack/lib/action_controller/metal/strong_parameters.rb:10:in `<top (required)>'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from /home/sirene/Escritorio/rails-master/actionpack/lib/action_controller.rb:5:in `<top (required)>'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from /home/sirene/Escritorio/rails-master/guides/rails_guides/generator.rb:57:in `<top (required)>'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `require'
	from rails_guides.rb:62:in `<main>'
rake aborted!
Command failed with status (1): [/usr/local/bin/ruby rails_guides.rb...]
/home/sirene/Escritorio/rails-master/guides/Rakefile:11:in `block (3 levels) in <top (required)>'
Tasks: TOP => guides:generate:html
(See full trace by running task with --trace)
sirene@cleopatra:~/Escritorio/rails-master/guides$