[Rails] Re: What is this error?

Here is the o/p of gem list

# gem list -d actionpack
/usr/local/rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/yaml.rb:56:in `<top
(required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your
ruby.

*** LOCAL GEMS ***

actionpack (3.2.2)
Author: David Heinemeier Hansson
Homepage: http://www.rubyonrails.org
Installed at: /usr/local/rvm/gems/ruby-1.9.3-p125

Web-flow and rendering framework putting the VC in MVC (part of
Rails).

# gem list -d action_pack
/usr/local/rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/yaml.rb:56:in `<top
(required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your
ruby.

*** LOCAL GEMS ***

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