无法在rvm上安装rails3

$ gem install rails
/data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:28:in `<top (required)>\': uninitialized constant Gem::ConfigFile (NameError)
        from /data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require\'
        from /data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require\'
        from /data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/gem_runner.rb:8:in `<top (required)>\'
        from /data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require\'
        from /data/home/manish/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require\'
        from /data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin/gem:9:in `<main>\'

$ rvm info

ruby-1.9.2-p180:

  system:
    uname:       \"Linux alioth-linux.gslab.com 2.6.23.1-42.fc8 #1 SMP Tue Oct 30 13:55:12 EDT 2007 i686 i686 i386 GNU/Linux\"
    bash:        \"/bin/bash => GNU bash, version 3.2.25(1)-release (i386-redhat-linux-gnu)\"
    zsh:         \"/bin/zsh => zsh 4.3.4 (i386-redhat-linux-gnu)\"

  rvm:
    version:      \"rvm 1.6.2 by Wayne E. Seguin (wayneeseguin@gmail.com) [https://rvm.beginrescueend.com/]\"

  ruby:
    interpreter:  \"ruby\"
    version:      \"1.9.2p180\"
    date:         \"2011-02-18\"
    platform:     \"i686-linux\"
    patchlevel:   \"2011-02-18 revision 30909\"
    full_version: \"ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]\"

  homes:
    gem:          \"/data/home/manish//.rvm/gems/ruby-1.9.2-p180\"
    ruby:         \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180\"

  binaries:
    ruby:         \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin/ruby\"
    irb:          \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin/irb\"
    gem:          \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin/gem\"
    rake:         \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin/rake\"

  environment:
    PATH:         \"/data/home/manish//.rvm/gems/ruby-1.9.2-p180/bin:/data/home/manish//.rvm/gems/ruby-1.9.2-p180@global/bin:/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/bin:/data/home/manish//.rvm/bin:/data/home/manish/ec2-api-tools-1.4.0.2/bin:/data/data/work/java/jdk1.6.0_18/bin:/usr/kerberos/bin:/usr/lib/ccache:/usr/local/bin:/bin:/usr/bin:/data/home/manish//bin\"
    GEM_HOME:     \"/data/home/manish//.rvm/gems/ruby-1.9.2-p180\"
    GEM_PATH:     \"/data/home/manish//.rvm/gems/ruby-1.9.2-p180:/data/home/manish//.rvm/gems/ruby-1.9.2-p180@global\"
    MY_RUBY_HOME: \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180\"
    IRBRC:        \"/data/home/manish//.rvm/rubies/ruby-1.9.2-p180/.irbrc\"
    RUBYOPT:      \"\"
    gemset:       \"\"