Mine

DISPATCHER FAILSAFE RESPONSE (has cgi) Fri Apr 13 15:24:43 +0100 2007
  Status: 500 Internal Server Error
  uninitialized constant TreeController
    /usr/vanruby/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:266:in `load_missing_constant'
    /usr/vanruby/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:452:in `const_missing'
    /usr/vanruby/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:464:in `const_missing'
    /usr/vanruby/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/inflector.rb:250:in `constantize'
    /usr/vanruby/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/core_ext/string/inflections.rb:148:in `constantize'
    /usr/vanruby/vendor/rails/actionpack/lib/action_controller/routing.rb:1289:in `recognize'
    /usr/vanruby/vendor/rails/railties/lib/dispatcher.rb:38:in `dispatch'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:168:in `process_request'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:143:in `process_each_request!'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:109:in `with_signal_handler'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:142:in `process_each_request!'
    /usr/local/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:612:in `each_cgi'
    /usr/local/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each'
    /usr/local/lib/ruby/gems/1.8/gems/fcgi-0.8.7/lib/fcgi.rb:609:in `each_cgi'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:141:in `process_each_request!'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:55:in `process!'
    /usr/vanruby/vendor/rails/railties/lib/fcgi_handler.rb:25:in `process!'
    /home/default/userdefinedsolutions.co.uk/user/htdocs/vanruby/dispatch.fcgi:25