migrate rails project from 1.1.6 to 2.2.2

I did the following.

1. I changed the rails version to 2.2.2 in environment.rb -
RAILS_GEM_VERSION = '2.2.2' unless defined? RAILS_GEM_VERSION

2. from project path I ran a rake task $ rake rails:update

3. when i run $ ruby script/about. I get the following output. Please
help me. What next to do - I am converting my rails app from 1.1.6 to
2.2.2.