Tuneup failure: NameError (uninitialized constant...

I just installed TuneUp today and tried to use it in our Rails 2.1.0 app (Ruby 1.8.6-p286, Mongrel 1.1.5). I get the following error in the logs and the TuneUp header bar only has the Logo and Title, nothing else…
Any ideas?
Thanks,
Eric
NameError (uninitialized constant ActionWebService::Dispatcher::ActionController::Base):
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:278:in `load_missing_constant’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:467:in `const_missing’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/tuneup_controller.rb:19:in `show’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `send’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1162:in `perform_action_without_filters’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:580:in `call_filters’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:573:in `perform_action_without_benchmark’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue’
/usr/local/ruby-1.8.6-p286/lib/ruby/1.8/benchmark.rb:293:in `measure’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/rescue.rb:201:in `perform_action_without_caching’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:13:in `perform_action_without_fiveruns_tuneup’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/query_cache.rb:8:in `cache’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:12:in `perform_action_without_fiveruns_tuneup’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup/instrumentation/action_controller/base.rb:31:in `perform_action’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup/instrumentation/utilities.rb:55:in `step’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup/instrumentation/action_controller/base.rb:30:in `perform_action’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup.rb:35:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup.rb:82:in `record’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup.rb:34:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup/instrumentation/action_controller/base.rb:23:in `perform_action’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `send’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `process_without_filters’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:569:in `process_without_session_management_support’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/session_management.rb:130:in `process_without_fiveruns_tuneup’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/fiveruns_tuneup-0.8.15/lib/fiveruns/tuneup/instrumentation/action_controller/base.rb:36:in `process’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:389:in `process’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:149:in `handle_request’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:107:in `dispatch’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `synchronize’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `dispatch’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:35:in `dispatch’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:76:in `process’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:74:in `synchronize’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:74:in `process’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:502:in `load’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:502:in `load’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:502:in `load’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/servers/mongrel.rb:64
/usr/local/ruby-1.8.6-p286/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
/usr/local/ruby-1.8.6-p286/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require’
/usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/rails-2.1.0/lib/commands/server.rb:39
/usr/local/ruby-1.8.6-p286/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
/usr/local/ruby-1.8.6-p286/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
script/server:3
Rendering /usr/local/ruby-1.8.6-p286/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/templates/rescues/layout.erb (internal_server_error)

I’m using 0.8.15 and have this problem despite the blog post about the 0.8.15 release that states it is supposed to fix a similar problem. Apparently I got 0.8.14 immediately right before the announcement. Can someone please help? Our application also uses Hobo if that helps.