>>50
> Exception `LoadError' at c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:871
> - no such file to load -- rubygems/defaults/operating_system
It fails to execute "require 'rubygems/defaults/operating_system'"

> Exception `NoMethodError' at c:/ruby/lib/ruby/1.8/rational.rb:78
> - undefined method `gcd' for Rational(1, 2):Rational
You might execute a code like Rational(1, 2).gcd,
but the Rational class does not have a method named gcd.