Я пытаюсь добавить модуль в мой проект xcode. Я получаю эту ошибку:

LoadError - нет такого файла для загрузки - xcodeproj / prebuilt / universal-darwin13.0-1.8.7 / xcodeproj_ext /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:ingem_original_require' /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:inrequire '/Library/Ruby/Gems/1.8/gems/xcodeproj-0.14.0/lib/xcodeproj/ext.rb:6 /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:ingem_original_require' /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:inrequire '/Library/Ruby/Gems/1.8/gems/xcodeproj-0.14.0/lib/xcodeproj/project.rb:4 /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer /analyzer.rb:488:incompute_target_platforms' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer/analyzer.rb:485:inкаждый '/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer/analyzer.rb:485:incompute_target_platforms' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer/analyzer.rb:55:inпроанализировать '/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer.rb:171:inanalyze' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer.rb:94:inresol_dependencies '/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/user_interface.rb:52:insection' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer.rb:93:in/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/installer.rb:86:in resol_dependencies 'install!' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/command/project.rb:38:inrun_install_with_update '/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/command/project.rb:68:inrun' /Library/Ruby/Gems/1.8/gems/claide-0.3.2/lib/claide/command.rb:206:inзапустить '/Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/lib/cocoapods/command.rb:51:inrun' /Library/Ruby/Gems/1.8/gems/cocoapods-0.27.1/bin/pod:19 /usr/bin/pod:23:inзагрузить '/ usr / bin / pod: 23

Содержимое моего подфайла:

pod 'RestKit', '~> 0.21.0'

Любая помощь будет оценена!