Redmine

I have installed redmine created a user for it created a database also but I am not able to run it /redmine# ruby script/server -e production

/usr/lib/ruby/1.8/rubygems.rb:578:in `report_activate_error': Could not find RubyGem test-spec (>= 0) (Gem::LoadError)
    from /usr/lib/ruby/1.8/rubygems.rb:134:in `activate'
    from /usr/lib/ruby/1.8/rubygems.rb:158:in `activate'
    from /usr/lib/ruby/1.8/rubygems.rb:157:in `each'
    from /usr/lib/ruby/1.8/rubygems.rb:157:in `activate'
    from /usr/lib/ruby/1.8/rubygems.rb:49:in `gem'
    from /root/redmine/vendor/rails/actionpack/lib/action_controller.rb:34
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from /root/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /root/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /root/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /root/redmine/vendor/rails/railties/lib/commands/server.rb:2
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
    from script/server:3

I am using a Debian Lenny .
I have read this page many times
http://www.redmine.org/wiki/redmine/RedmineInstall
but now I have given up.Can some one help?