problem running selenium with capybara/cucumber

gistfile1.rb

# features/ask_a_question.feature

Feature: Asking a question

    @javascript @wip
    Scenario Outline: Using the question preview
      Given that I am a user
      When I go to the homepage
      And I fill in "question_title" with "<Question Title>"
      And I fill in "question_body" with "<Input Body>"
      When I follow "preview"
      Then I should see "<Output Body>"
      
      Examples:
        | Question Title | Input Body   | Output Body   |
        | Hello          | This is cool | This is cool  |



# config/cucumber.yml

<%
rerun = File.file?('rerun.txt') ? IO.read('rerun.txt') : ""
rerun_opts = rerun.to_s.strip.empty? ? "--format #{ENV['CUCUMBER_FORMAT'] || 'progress'} features" : "--format #{ENV['CUCUMBER_FORMAT'] || 'pretty'} #{rerun}"
std_opts = "--format #{ENV['CUCUMBER_FORMAT'] || 'progress'} --strict --tags ~@wip"
%>
default: <%= std_opts %> features
wip: --tags @wip:3 --wip features
rerun: <%= rerun_opts %> --format rerun --out rerun.txt --strict --tags ~@wip


# config/environments/cucumber.rb

config.cache_classes = true
config.whiny_nils = true
config.action_controller.consider_all_requests_local = true
config.action_controller.perform_caching             = false
config.action_controller.allow_forgery_protection    = false
config.action_mailer.delivery_method = :test


# feature/support/env.rb

ENV["RAILS_ENV"] ||= "cucumber"
require File.expand_path(File.dirname(__FILE__) + '/../../config/environment')

require 'cucumber/formatter/unicode' # Remove this line if you don't want Cucumber Unicode support
require 'cucumber/rails/rspec'
require 'cucumber/rails/world'
require 'cucumber/rails/active_record'
require 'cucumber/web/tableish'

require 'capybara/rails'
require 'capybara/cucumber'
require 'capybara/session'
require 'cucumber/rails/capybara_javascript_emulation'
Capybara.default_selector  = :css
Capybara.javascript_driver = :selenium

ActionController::Base.allow_rescue = false

Cucumber::Rails::World.use_transactional_fixtures = true

Fixtures.reset_cache
fixtures_folder = File.join(RAILS_ROOT, "test", "fixtures")
fixtures = Dir[File.join(fixtures_folder, '*.yml')].map {|f| File.basename(f, '.yml') }
Fixtures.create_fixtures(fixtures_folder, fixtures)

if defined?(ActiveRecord::Base)
  begin
    require 'database_cleaner'
    DatabaseCleaner.strategy = :truncation
  rescue LoadError => ignore_if_database_cleaner_not_present
  end
end

require 'shoulda'
require 'shoulda/action_mailer/assertions'

World(Shoulda::ActionMailer::Assertions)




# output

bundle exec /Users/JamieD/.rvm/rubies/ruby-1.8.7-p302/bin/ruby -I "/Users/JamieD/.rvm/gems/ruby-1.8.7-p302/gems/cucumber-0.8.5/lib:lib" "/Users/JamieD/.rvm/gems/ruby-1.8.7-p302/gems/cucumber-0.8.5/bin/cucumber"  --profile wip
Using the wip profile...
config.gem: Unpacked gem i18n-0.2.2 in vendor/gems has no specification file. Run 'rake gems:refresh_specs' to fix this.
/Users/JamieD/.rvm/gems/ruby-1.8.7-p302/gems/chronic_duration-0.9.2/lib/numerizer.rb:27: warning: already initialized constant DIRECT_NUMS
/Users/JamieD/.rvm/gems/ruby-1.8.7-p302/gems/chronic_duration-0.9.2/lib/numerizer.rb:38: warning: already initialized constant TEN_PREFIXES
/Users/JamieD/.rvm/gems/ruby-1.8.7-p302/gems/chronic_duration-0.9.2/lib/numerizer.rb:45: warning: already initialized constant BIG_PREFIXES
* Starting Solr in cucumber on 8984
* Waiting for port 8984 to open
* Waiting for port 8984 to open
* Solr started
Mocha deprecation warning: Mocha::Standalone has been renamed to Mocha::API
Feature: Asking a question
  In order to ask my question whenever I feel like it
  As a user or a guest
  I want to be able to ask my question from a variety of locations

  Background:                                                                              # features/ask_a_question.feature:6
    Given a subject: "Common Room" exists with name: "Common Room", realtime: false        # features/step_definitions/pickle_steps.rb:4
    Given a subject: "Online Tutoring" exists with name: "Online Tutoring", realtime: true # features/step_definitions/pickle_steps.rb:4
    And a subject exists with parent: subject "Common Room", name: "Maths"                 # features/step_definitions/pickle_steps.rb:4
    And a subject exists with parent: subject "Online Tutoring", name: "Realtime Maths"    # features/step_definitions/pickle_steps.rb:4
    And a subject exists with parent: subject "Online Tutoring", name: "Realtime English"  # features/step_definitions/pickle_steps.rb:4

  # Then I should see "Congratulations - your question was successfully created"
  @javascript @wip
  Scenario Outline: Using the question preview             # features/ask_a_question.feature:159
    Given that I am a user                                 # features/step_definitions/authentication_steps.rb:1
    When I go to the homepage                              # features/step_definitions/web_steps.rb:23
    And I fill in "question_title" with "<Question Title>" # features/step_definitions/web_steps.rb:39
    And I fill in "question_body" with "<Input Body>"      # features/step_definitions/web_steps.rb:39
    When I follow "preview"                                # features/step_definitions/web_steps.rb:33
    Then I should see "<Output Body>"                      # features/step_definitions/web_steps.rb:107

    Examples: 
      | Question Title | Input Body   | Output Body  |
      | Hello          | This is cool | This is cool |
      Capybara::TimeoutError (Capybara::TimeoutError)
      ./features/step_definitions/web_steps.rb:24:in `/^(?:|I )go to (.+)$/'
      features/ask_a_question.feature:160:in `Given that I am a user'

Failing Scenarios:
cucumber -p wip features/ask_a_question.feature:159 # Scenario: Using the question preview

1 scenario (1 failed)
11 steps (1 failed, 5 skipped, 5 passed)
0m11.042s