[Rails] autotest error

Hello,

I can't make autotest running on Ubuntu, please help.

Error message:
/.rvm/gems/ruby-1.9.2-p180/gems/test-unit-2.3.0/lib/test/unit/ui/
console/testrunner.rb:336:in `<module:Console>': uninitialized
constant Test::Unit::UI::Console::Diff (NameError)

Copied .autotest file from here:
http://automate-everything.com/lang/en/2009/08/gnome-and-autospec-notifications/

What does it mean? Many thanks for your help!
Zoli

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