I'm having this error : Setting up Apache+Mongrel+Gems+Rails ERROR, someone help? gem install rails /usr/lib64/site_ruby/1.8/rubygems/custom_require.rb:35:in `require': No such file to load -- sources (LoadError) from /usr/lib64/site_ruby/1.8/rubygems/remote_installer.rb:462:in `sources' from /usr/lib64/site_ruby/1.8/rubygems/remote_installer.rb:472:in `source_index_hash' from /usr/lib64/site_ruby/1.8/rubygems/remote_installer.rb:436:in `install' from /usr/lib64/site_ruby/1.8/rubygems/gem_commands.rb:258:in `execute' from /usr/lib64/site_ruby/1.8/rubygems/gem_commands.rb:220:in `each' from /usr/lib64/site_ruby/1.8/rubygems/gem_commands.rb:220:in `execute' from /usr/lib64/site_ruby/1.8/rubygems/command.rb:69:in `invoke' from /usr/lib64/site_ruby/1.8/rubygems/cmd_manager.rb:117:in `process_args' from /usr/lib64/site_ruby/1.8/rubygems/cmd_manager.rb:88:in `run' from /usr/lib64/site_ruby/1.8/rubygems/gem_runner.rb:29:in `run' from /usr/bin/gem:23 CentOS