Webrick startup problem

I had my application running perfectly in the 1.8.2th version of ruby.
Now I have updated the version of ruby to 1.8.6(through the one-click
installer). I again installed the rails,uuid, and all other plugins.

I am able to start the application of some applications. But for this
application it is giving this error.

Can some body help me…THANKS in advance.

=> Booting WEBrick…
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:422:in
remove_const': cannot remove Object::LogServer (NameError) from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:422:insend’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:422:in
remove_constant' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:368:innew_constants_in’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:368:in
each' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:368:innew_constants_in’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in
require' from c:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/webrick.rb:52 from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:ingem_original_require’
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
require' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:inrequire’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:342:in
new_constants_in' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:inrequire’
from
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39
from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
gem_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:inrequire’
from script/server:5
[2007-04-04 10:30:16] INFO going to shutdown …
[2007-04-04 10:30:16] INFO WEBrick::HTTPServer#start done.