Rail project creation error on ubuntu 12.04

this is the ruby version I used.
ruby -version
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
-e:1:in `<main>': undefined local variable or method `rsion' for
main:Object (NameError)

How did u install it, using rvm? I have written a blog which you can follow to install ruby and rails http://acupofrails.wordpress.com/2012/03/16/installing-rails-on-ubuntu/ . But for this error, sorry, I don’t have specific answer.