Получение неинициализированной постоянной ошибки с помощью RSpec. Понятия не имею, что его вызывает

Я использую RSpec для тестирования, и когда я ушел с работы в пятницу днем, мои тесты проходили успешно. Но когда я пошел домой и синхронизировал свой репозиторий, тесты на моем ноутбуке не прошли. Вернувшись к работе, тесты по-прежнему не работают. Не верьте, что это мой код, поскольку запуск rspec сам по себе возвращает ошибку, и spork даже не запускается. Когда я пытаюсь запустить Spork, я получаю следующее сообщение об ошибке:

Using RSpec
Loading Spork.prefork block...
uninitialized constant ActionView::Template::Handlers::ERB::ENCODING_FLAG (NameError)
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/rspec-core-2.2.1/lib/rspec/core/backward_compatibility.rb:20:in `const_missing'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers/erb.rb:85:in `<class:ERB>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers/erb.rb:70:in `<module:Handlers>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers/erb.rb:28:in `<class:Template>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers/erb.rb:27:in `<module:ActionView>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers/erb.rb:6:in `<top (required)>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/handlers.rb:10:in `extended'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template.rb:99:in `extend'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template.rb:99:in `<class:Template>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template.rb:8:in `<module:ActionView>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template.rb:6:in `<top (required)>'
<internal:lib/rubygems/custom_require>:29:in `require'
<internal:lib/rubygems/custom_require>:29:in `require'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/template/resolver.rb:3:in `<top (required)>'
<internal:lib/rubygems/custom_require>:29:in `require'
<internal:lib/rubygems/custom_require>:29:in `require'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/actionpack-3.0.3/lib/action_view/testing/resolvers.rb:1:in `<top (required)>'
<internal:lib/rubygems/custom_require>:29:in `require'
<internal:lib/rubygems/custom_require>:29:in `require'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/rspec-rails-2.2.1/lib/rspec/rails/view_rendering.rb:1:in `<top (required)>'
<internal:lib/rubygems/custom_require>:29:in `require'
<internal:lib/rubygems/custom_require>:29:in `require'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/rspec-rails-2.2.1/lib/rspec/rails.rb:9:in `<top (required)>'
<internal:lib/rubygems/custom_require>:33:in `require'
<internal:lib/rubygems/custom_require>:33:in `rescue in require'
<internal:lib/rubygems/custom_require>:29:in `require'
/home/jeff/Projects/Rails/vahsfbhistory/spec/spec_helper.rb:10:in `block in <top (required)>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork.rb:23:in `prefork'
/home/jeff/Projects/Rails/vahsfbhistory/spec/spec_helper.rb:5:in `<top (required)>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/test_framework.rb:138:in `load'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/test_framework.rb:138:in `block (2 levels) in preload'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/app_framework.rb:64:in `preload'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/test_framework.rb:134:in `block in preload'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork.rb:67:in `exec_prefork'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/test_framework.rb:120:in `preload'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/run_strategy/forking.rb:25:in `preload'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/runner.rb:74:in `run'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/lib/spork/runner.rb:9:in `run'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/gems/spork-0.8.4/bin/spork:10:in `<top (required)>'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/bin/spork:19:in `load'
/home/jeff/.rvm/gems/ruby-1.9.2-p0@rails3tutorial/bin/spork:19:in `<main>'

Кто-нибудь знает, что может быть причиной этого?