Ruby on Rails

Hi,
when running - 'ruby setup.rb' I get the following error message:

C:\rubygems-1.3.7>ruby setup.rb
C:/rubygems-1.3.7/lib/rubygems/source_index.rb:68:in
installed_spec_directories': undefined method `path' for Gem:Module
(NoMethodError)

Ruby version is ruby-1.9.2-p0.
Any idea ?

Thanks.

Dani
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