[Rails] Can't setup Rails with RVM in ubuntu 12.04

I'm doing setu Ruby on Rails with RVM.

I had setup ruby 1.9.3 p429 and RVM,RubyGem... succesfully

But I can't setup Rails with command : gem install rails because of
error:

ERROR: While executing gem ... (Gem::DependencyError)
Unable to resolve dependencies: rails requires activesupport (=
3.2.13), actionpack (= 3.2.13), activerecord (= 3.2.13), activeresource
(= 3.2.13), actionmailer (= 3.2.13), railties (= 3.2.13)
and Rails is 2.3.14

please help me solve this problem.Thanks.....

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