gem install error, index not found, ruby on rails -

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Problem: No gem can install any type, but if I think this is a problem, Have to install.

When I run sudo gem install "gem_name" I get the following error: 

  Warning: RubyGems was not found for the 1.2+ index : The RubyGems Heritage Index will return for abusive performance. Updating the Joom Source Index for Bulk: http://gems.rubyforge.org/

What to do ??

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