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 Installing Rails on Ubuntu | Ruby On Rails Blog . But for this error, sorry, I don’t have specific answer.