Ruby on Rails

hi i am trying to install rubygem 1.3.7 on my linux system, i am using
ruby 1.9.2p0, when i try to install rubygem i get the following error:

/opt/rubygems-1.3.7/lib/rubygems/source_index.rb:68:in
`installed_spec_directories': undefined method `path' for Gem:Module
(NoMethodError)
from /opt/rubygems-1.3.7/lib/rubygems/source_index.rb:58:in
`from_installed_gems'
from /opt/rubygems-1.3.7/lib/rubygems.rb:883:in `source_index'
from /opt/rubygems-1.3.7/lib/rubygems/gem_path_searcher.rb:81:in
`init_gemspecs'
from /opt/rubygems-1.3.7/lib/rubygems/gem_path_searcher.rb:13:in
`initialize'
from /opt/rubygems-1.3.7/lib/rubygems.rb:841:in `new'
from /opt/rubygems-1.3.7/lib/rubygems.rb:841:in `block in searcher'
from <internal:prelude>:10:in `synchronize'
from /opt/rubygems-1.3.7/lib/rubygems.rb:840:in `searcher'
from /opt/rubygems-1.3.7/lib/rubygems.rb:479:in `find_files'
from /opt/rubygems-1.3.7/lib/rubygems.rb:983:in `load_plugins'
from /opt/rubygems-1.3.7/lib/rubygems.rb:1139:in `<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in `require'
from <internal:lib/rubygems/custom_require>:29:in `require'
from setup.rb:24:in `<main>'

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