Ruby on Rails

Hi ,

I m unable to install rails by using rvm(ruby version manager ).


Error im getting :

 gem install rails
ERROR:  Loading command: install (LoadError)
    no such file to load -- zlib
ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::InstallCommand


My  cuurent ruby version : 1.9.2
gem version : 1.8.0


Thanks,
Sai

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