[Mongrel] upgrading rails to 1.2.2 giving me mongrel errors

[Dallas DeVries]

I'm working on upgrading to rails 1.2.2 from 1.1.6 and getting the mongrel
error below in development mode.  Now things seem to work fine with 1.1.6and
1.2.2 (in prod mode).
Any ideas what might cause this?  Googling gave me very little to work
with.  This was the closest thing i found
http://dev.rubyonrails.org/ticket/6716

I'm running Ubuntu with mongrel 1.0.1 and fastthread 0.6.4.1.  I also get
this on macosx

Thanks!
Dallas


Error calling Dispatcher.dispatch #<NameError: cannot remove
Object::USER_AGENT>
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.1/lib/active_support/dependencies.rb:422:in
`remove_const'
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.1/lib/active_support/dependencies.rb:422:in
`remove_constant'
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.1/lib/active_support/dependencies.rb:273:in
`remove_unloadable_constants!'
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.1/lib/active_support/dependencies.rb:273:in
`remove_unloadable_constants!'
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.1/lib/active_support/dependencies.rb:72:in
`clear'
/usr/lib/ruby/gems/1.8/gems/rails-1.2.2/lib/dispatcher.rb:60:in
`reset_application!'
/usr/lib/ruby/gems/1.8/gems/rails-1.2.2/lib/dispatcher.rb:116:in
`reset_after_dispatch'
/usr/lib/ruby/gems/1.8/gems/rails-1.2.2/lib/dispatcher.rb:51:in `dispatch'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:78:in
`process'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:76:in
`process'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:618:in
`process_client'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in
`process_client'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in `run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in `run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in `run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:271:in
`run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:270:in
`run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:127:in `run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/command.rb:211:in
`run'
/usr/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:243
/usr/bin/mongrel_rails:18
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