Error occurring using guard in rails 3.1.1

Question

Hey guys I'm following the rails tutorial found here http://net.tutsplus.com/tutorials/ruby/the-intro-to-rails-screencast-i-wish-i-had/ and I've gotten to the point where you use guard to execute unit tests. I keep getting the error found below when using guard, I tried installing the activesupport gem but it still seems to fail. If anyone has any tips on how to fix this I would appreciate it thanks :)

I'm also running 64 bit Ubuntu

chuck@chuck-laptop:~/rails/tasks$ bundle exec guard
Guard could not detect any of the supported notification libraries.
Guard is now watching at '/home/chuck/rails/tasks'
Guard::RSpec is running, with RSpec 2!
Running all specs
/home/chuck/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/test/unit/assertions.rb:5:in `<module:Test>': Unit is not a module (TypeError)
    from /home/chuck/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/test/unit/assertions.rb:4:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.8.1/lib/rspec/rails/adapters.rb:2:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.8.1/lib/rspec/rails.rb:10:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/rails/tasks/spec/spec_helper.rb:4:in `<top (required)>'
    from /home/chuck/rails/tasks/spec/requests/tasks_spec.rb:1:in `require'
    from /home/chuck/rails/tasks/spec/requests/tasks_spec.rb:1:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `block in load_spec_files'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `map'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load_spec_files'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/command_line.rb:22:in `run'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:80:in `run_in_process'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:69:in `run'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:10:in `block in autorun'
Guard::RSpec is running, with RSpec 2!
Running all specs
/home/chuck/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/test/unit/assertions.rb:5:in `<module:Test>': Unit is not a module (TypeError)
    from /home/chuck/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/test/unit/assertions.rb:4:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.8.1/lib/rspec/rails/adapters.rb:2:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-rails-2.8.1/lib/rspec/rails.rb:10:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `block in require'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/dependencies.rb:240:in `require'
    from /home/chuck/rails/tasks/spec/spec_helper.rb:4:in `<top (required)>'
    from /home/chuck/rails/tasks/spec/requests/tasks_spec.rb:1:in `require'
    from /home/chuck/rails/tasks/spec/requests/tasks_spec.rb:1:in `<top (required)>'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `block in load_spec_files'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `map'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load_spec_files'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/command_line.rb:22:in `run'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:80:in `run_in_process'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:69:in `run'
    from /home/chuck/.rvm/gems/ruby-1.9.2-p290/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:10:in `block in autorun'
Bye bye...

Answer 1

WORKAROUND:

1. Remove turn gem from Gemfile.
2. gem uninstall turn

I copypasted the workaround from here

BTW, I don't want to go too offtopic, but if you solve this issue and follow the tutorial, let me give you an advice: If you get stuck on

Failure/Error: @task = Task.create :task => 'go to bed'
     ActiveRecord::StatementInvalid:
       Could not find table 'tasks'

Then run this command:

rake

The problem is, instead of that one, they tell you to run:

rake db:migrate

Which is fine, but does not migrate the test database.

Cheers!