[Rails] What is this error?

I seem to have correct include path, but a lot of gems can't be loaded
via "required". What could be the problem?

#!/usr/bin/ruby -w
require "cgi" # cant load this
require "actionpack" # can not load this

# /var/www/ruby/test.rb
/var/www/ruby/test.rb:3:in `require': no such file to load --
/var/lib/gems/1.9.2/gems/passenger-3.0.11/test/stub/vendor_rails/minimal/actionpack
(LoadError)
from /var/www/ruby/test.rb:3:in `<main>'

# gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.7
- RUBY VERSION: 1.9.2 (2010-07-02 patchlevel -1) [i486-linux]
- INSTALLATION DIRECTORY: /var/lib/gems/1.9.2/gems/
- RUBY EXECUTABLE: /usr/bin/ruby1.9.2
- EXECUTABLE DIRECTORY: /var/lib/gems/1.9.2/gems/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86-linux
- GEM PATHS:
- /var/lib/gems/1.9.2/gems/
- /root/.gem/ruby/1.9.2
- /var/lib/gems/1.9.2
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://rubygems.org/

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