Problema Con Ruby On Rail y Oracle

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Estoy instalando una aplicación hecha sobre RoR en mi máquina que tiene
Ubuntu Jaunty, ya instalé Ruby, Rails, las gemas, el adaptador OCI8 (el
cual también probé por consola y funciona). Pero cuando corro: “ruby
script/server”, me sale éste error:

/usr/local/lib/site_ruby/1.8/rubygems.rb:270:in `activate': undefined
method `map' for nil:NilClass (NoMethodError)
  from /usr/local/lib/site_ruby/1.8/rubygems.rb:296:in `activate'
  from /usr/local/lib/site_ruby/1.8/rubygems.rb:295:in `each'
  from /usr/local/lib/site_ruby/1.8/rubygems.rb:295:in `activate'
  from /usr/local/lib/site_ruby/1.8/rubygems.rb:68:in `gem'
  from
/opt/redmine/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:226:in
`establish_connection'
  from
/opt/redmine/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:216:in
`establish_connection'
  from
/opt/redmine/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:209:in
`establish_connection'
  from
./script/../config/../vendor/rails/railties/lib/initializer.rb:341:in
`initialize_database'
  from
./script/../config/../vendor/rails/railties/lib/initializer.rb:124:in
`process'
  from
./script/../config/../vendor/rails/railties/lib/initializer.rb:97:in
`send'
  from
./script/../config/../vendor/rails/railties/lib/initializer.rb:97:in
`run'
  from /opt/redmine/config/environment.rb:20
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:510:in
`require'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:355:in
`new_constants_in'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:510:in
`require'
  from
/opt/redmine/vendor/rails/railties/lib/commands/servers/webrick.rb:59
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:510:in
`require'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:355:in
`new_constants_in'
  from
/opt/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:510:in
`require'
  from /opt/redmine/vendor/rails/railties/lib/commands/server.rb:39
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
  from script/server:3

La base de datos se encuentra en otra máquina. Probé con un comando
similar a éste y funcionó:

ruby -r oci8 -e "OCI8.new('hr', 'hr_password', 'ORCL').exec('SELECT * FROM jobs ORDER BY 1') do |r| puts r.join(' | '); end"

Soy muy nuevo en Ruby On Rails, espero me puedan guiar para solucionar
éste problema… saludos.