>>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.