Problem with my rails 2.2.2

I have installed rails 2.2.2.when i created my rails project with version 2.2.2 its throwing error

Missing the Rails 2.2.2 gem. Please `gem install -v=2.2.2 rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed.

but in my machine rails 2.2.2 is installed

what does "rails -v" give you? what's in your environment.rb?