Require gem problem

Hi to all, i have Ubuntu 10.04 installed, and:

ruby1.9.1-full
rubygems1.9.1

But i cant require any gems, like in this example:

require 'rubygems'
require 'RedCloth'

For example to use RedCloth i have to add this line to the code:
require 'rubygems'
gem 'RedCloth' <--
require 'RedCloth'

which is kinda weird, because i have used gems before only with the
rubygems require, and the gem name require.

This is the error i get when using the first require example:
LoadError: no such file to load -- RedCloth
  from (irb):2:in `require'
  from (irb):2
  from /usr/bin/irb:12:in `<main>'

Now, if i try to use activerecord, i get the same error, but if i add
the gem line between the rubygems, and gemname requires, i get a
different error:

Gem::LoadError: Could not find RubyGem active_record (>= 0)

  from /usr/local/lib/site_ruby/1.9.1/rubygems.rb:779:in
`report_activate_error'
  from /usr/local/lib/site_ruby/1.9.1/rubygems.rb:214:in `activate'
  from /usr/local/lib/site_ruby/1.9.1/rubygems.rb:1082:in `gem'
  from (irb):2
  from /usr/bin/irb:12:in `<main>'
Is there something i can do? I have seen various posts on the internet,
but i have not been able to find the solution.

This is my gem environment

RubyGems Environment:
  - RUBYGEMS VERSION: 1.3.7
  - RUBY VERSION: 1.9.1 (2010-01-10 patchlevel 378) [i486-linux]
  - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /usr/bin/ruby1.9.1
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-linux
  - GEM PATHS:
     - /usr/lib/ruby/gems/1.9.1
     - /home/jaime/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

I have only ruby 1.9.1 installed no other version is installed.

Please help...

Thanks in advanced.

Jaime Gonzalez.

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For example to use RedCloth i have to add this line to the code:
require 'rubygems'
gem 'RedCloth' <--
require 'RedCloth'

http://wiki.github.com/rdp/ruby_tutorials_core/ruby-talk-faq#gem_loading_fails_191

might help. Worth a try (has instructions on how to avoid using
gem_prelude).

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