Rails - Jan 2007 - InstantRails upgraded from 1.1.6 has problems:.rb:423:in `remove_const': cannot remove Object

I developed a project on RoR 1.1.6 and it works fine.

On my development machine ( Windows XP, InstantRails 1.4)
I used gem install rails --source http://gems.rubyonrails.org
--include-dependencies
and upgraded Rails to 1.1.6.5848

When I tried to start my application, the following error occurs and I
couldn''t find any clue to solve it. Please help.

C:\RoR1.2\rails_apps\bidhelper_dev>ruby script/server webrick
=> Booting WEBrick...
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/active_suppor
t/dependencies.rb:423:in `remove_const'': cannot remove
Object::ModelTranslation
(NameError)
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:423:in `send''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:423:in `remove_constant''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:369:in `new_constants_in''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:369:in `each''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:369:in `new_constants_in''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:496:in `require''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6.5848/lib/commands
/servers/webrick.rb:52
        from
C:/RoR1.2/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27
:in `gem_original_require''
         ... 7 levels...
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:496:in `require''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:343:in `new_constants_in''
        from
C:/RoR1.2/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1.5848/lib/
active_support/dependencies.rb:496:in `require''
        from script/server:3


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