Gem_original_require feed_tools (MissingSourceFile)

ruby-talk
1

ruby -1.8.7
rails -2.3.8
gem -1.4.2
while running the sserver i am geting this error. please help me..

C:\Sites\gold\branches\gold1.1>ruby script/server
=> Booting WEBrick
=> Rails 2.3.8 application starting on http://0.0.0.0:3000
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in
`gem_original
_require': no such file to load -- feed_tools (MissingSourceFile)
        from
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in
`require'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:156:in `require'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:521:in `new_constants_in'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:156:in `require'
        from C:/Sites/gold/branches/gold1.1/config/environment.rb:115
        from
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in
`gem_original_require'
        from
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in
`require'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:156:in `require'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:521:in `new_constants_in'
        from
C:/Sites/gold/branches/gold1.1/vendor/rails/activesupport/lib/activ
e_support/dependencies.rb:156:in `require'

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