Here's the code I get when I'm running the bundle exec rspec spec/.
I pretty much copy-pasted everything Hartl told me to do, but I can't even get a red test off of this. In my gemfile, I added the factory_girls_rails v. 4.2.1 gem, but I noticed there was already a default factory_girls gem 4.2.0 in there. Is that the conflict?
No DRb server is running. Running in local process instead ...
/home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver/common/zipper.rb:1:in `require': cannot load such file -- zip/zip (LoadError)
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver/common/zipper.rb:1:in `<top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver/common.rb:9:in `require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver/common.rb:9:in `<top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver.rb:29:in `require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium/webdriver.rb:29:in `<top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium-webdriver.rb:1:in `require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/selenium-webdriver-2.0.0/lib/selenium-webdriver.rb:1:in `<top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from /home/nemo/rails_projects/sample_app/config/application.rb:12:in `<top (required)>'
from /home/nemo/rails_projects/sample_app/config/environment.rb:2:in `require'
from /home/nemo/rails_projects/sample_app/config/environment.rb:2:in `<top (required)>'
from /home/nemo/rails_projects/sample_app/spec/spec_helper.rb:6:in `require'
from /home/nemo/rails_projects/sample_app/spec/spec_helper.rb:6:in `block in <top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/spork-1.0.0rc3/lib/spork.rb:24:in `prefork'
from /home/nemo/rails_projects/sample_app/spec/spec_helper.rb:4:in `<top (required)>'
from /home/nemo/rails_projects/sample_app/spec/models/user_spec.rb:1:in `require'
from /home/nemo/rails_projects/sample_app/spec/models/user_spec.rb:1:in `<top (required)>'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `block in load_spec_files'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `each'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load_spec_files'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/command_line.rb:22:in `run'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:77:in `rescue in run'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:73:in `run'
from /home/nemo/.rvm/gems/ruby-1.9.3-p448@railstutorial_rails_4_0/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:17:in `block in autorun'