Installing selenium-on-rails - error on rake test

I’m following the instructions on installing Selenium on rails: "
Run the Rakefile in the plugin???s directory to run the tests in order to see that everything works"

When I rake:

DKMac:selenium-on-rails DK$ rake test

I get the following error:

/Users/DK/.rvm/gems/ruby-1.8.7-p174/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:105:in `const_missing’: uninitialized constant ActionView::Base::Helpers (NameError)

Am I correct in running the rake task directly from the plugin directory as above?

Using Rails 2.3.8, Ruby 1.8.7. The issue above looks like was something that was coming up for people who tried to install this with rails 2.1, but sounds like was fixed.