Cucumber + Capybara + tiny_mce Problem

Hello
I want to test the the tiny_mce using cucumber and capybara and I got a solution in the following thred “http://groups.google.com/group/ruby-capybara/browse_thread/thread/711d08ddceb9276?pli=1” but somehow I am getting the following error
private method `bridge’ called for #<Selenium::WebDriver::Driver:0x…fb55cd4f0 browser=:firefox> (NoMethodError)

Is there anyone who faced the same issue and able to resolve it please share your solution

Thanks
Abhis