Ruby on Rails

This is the output of gem env.
RubyGems Environment:
 - RUBYGEMS VERSION: 1.3.7
 - RUBY VERSION: 1.9.2 (2010-08-18 patchlevel 0) [x86_64-linux]
 - INSTALLATION DIRECTORY: /home/.rvm/gems/ruby-1.9.2-p0
 - RUBY EXECUTABLE: /home/.rvm/rubies/ruby-1.9.2-p0/bin/ruby
 - EXECUTABLE DIRECTORY: /home/.rvm/gems/ruby-1.9.2-p0/bin
 - RUBYGEMS PLATFORMS:
   - ruby
   - x86_64-linux
 - GEM PATHS:
    - /home/.rvm/gems/ruby-1.9.2-p0
    - /home/.rvm/gems/ruby-1.9.2-p0@global
 - GEM CONFIGURATION:
    - :update_sources => true
    - :verbose => true
    - :benchmark => false
    - :backtrace => false
    - :bulk_threshold => 1000
 - REMOTE SOURCES:
    - http://rubygems.org/

Full error:

rails s

/home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:228:in
`activate': undefined method `map' for nil:NilClass (NoMethodError)

 from /home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:254:in
`block in activate'
 from /home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:253:in
`each'
 from /home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:253:in
`activate'
 from
/home/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems.rb:1119:in
`try_activate'
 from <internal:lib/rubygems/custom_require>:32:in `rescue in require'
 from <internal:lib/rubygems/custom_require>:29:in `require'
 from script/rails:6:in `<main>'

--

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