webrick failing with "NameError: cannot remove Object::UnknownPropertyMethod"

Hi,

I just downloaded the latest rails, and tried to run webrick. I get
this strange
set of error messages. It looks like the real error is
    NameError: cannot remove Object::UnknownPropertyMethod

I never had this problem with older versions, and the 'fastcgi'
variant, running
under lighttpd runs fine. Any ideas why webrick appears to be
broken?

Thanks,

David

DEPRECATION WARNING: model is deprecated and will be removed from
Rails 2.0 See http://www.rubyonrails.org/depr
ecation for details. (called from ./script/../config/../app/
controllers/application.rb:7)
DEPRECATION WARNING: depend_on is deprecated and will be removed from
Rails 2.0 See http://www.rubyonrails.org/
deprecation for details. (called from model_without_deprecation at /
usr/local/lib/ruby/gems/1.8/gems/actionpack-
1.13.3/lib/action_controller/deprecated_dependencies.rb:13)
DEPRECATION WARNING: model is deprecated and will be removed from
Rails 2.0 See http://www.rubyonrails.org/depr
ecation for details. (called from ./script/../config/../app/
controllers/a pplication.rb:8)
DEPRECATION WARNING: depend_on is deprecated and will be removed from
Rails 2.0 See http://www.rubyonrails.org/
deprecation for details. (called from model_without_deprecation at /
usr/local/lib/ruby/gems/1.8/gems/actionpack-
1.13.3/lib/action_controller/deprecated_dependencies.rb:13)
#<NameError: cannot remove Object::UnknownPropertyMethod>
["/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:422:in `remove_const' ", "/usr/
local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/
dependencies.rb:422:in `send'", "/u sr/local/lib/ruby/gems/1.8/
gems/activesupport-1.4.2/lib/active_support/dependencies.rb:422:in
`remove_constant'" , "/usr/local/lib/ruby/gems/1.8/gems/
activesupport-1.4.2/lib/active_support/dependencies.rb:273:in
`remove_unloa dable_constants!'", "/usr/local/lib/ruby/gems/
1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:
27 3:in `each'", "/usr/local/lib/ruby/gems/1.8/gems/
activesupport-1.4.2/lib/active_support/dependencies.rb:273:in
` remove_unloadable_constants!'", "/usr/local/lib/ruby/gems/
1.8/gems/activesupport-1.4.2/lib/active_support/depend
encies.rb:72:in `clear'", "/usr/local/lib/ruby/gems/1.8/gems/
rails-1.2.3/lib/dispatcher.rb:60:in `reset_applicat ion!'", "/
usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:116:in
`reset_after_dispatch'", "/usr/l ocal/lib/ruby/gems/1.8/gems/
rails-1.2.3/lib/dispatcher.rb:51:in `dispatch'", "/usr/local/lib/ruby/
gems/1.8/gems/ rails-1.2.3/lib/webrick_server.rb:113:in
`handle_dispatch'", "/usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/
lib/ webrick_server.rb:79:in `service'", "/usr/local/lib/ruby/
1.8/webrick/httpserver.rb:104:in `service'", "/usr/loca l/lib/
ruby/1.8/webrick/httpserver.rb:65:in `run'", "/usr/local/lib/ruby/1.8/
webrick/server.rb:173:in `start_thre ad'", "/usr/local/lib/
ruby/1.8/webrick/server.rb:162:in `start'", "/usr/local/lib/ruby/1.8/
webrick/server.rb:162 :in `start_thread'", "/usr/local/lib/
ruby/1.8/webrick/server.rb:95:in `start'", "/usr/local/lib/ruby/1.8/
webrick /server.rb:92:in `each'", "/usr/local/lib/ruby/1.8/
webrick/server.rb:92:in `start'", "/usr/local/lib/ruby/1.8/we
brick/server.rb:23:in `start'", "/usr/local/lib/ruby/1.8/webrick/
server.rb:82:in `start'", "/usr/local/lib/ruby/ gems/1.8/gems/
rails-1.2.3/lib/webrick_server.rb:63:in `dispatch'", "/usr/local/lib/
ruby/gems/1.8/gems/rails-1.2. 3/lib/commands/servers/
webrick.rb:59", "/usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `gem_ original_require'", "/usr/local/
lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'", "/
usr/local/ lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:495:in `require'", "/usr/local/
lib /ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/
dependencies.rb:342:in `new_constants_in'", "/usr/loc al/lib/
ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/
dependencies.rb:495:in `require'", "/usr/local/ lib/ruby/gems/
1.8/gems/rails-1.2.3/lib/commands/server.rb:39", "/usr/local/lib/ruby/
site_ruby/1.8/rubygems/custo m_require.rb:27:in
`gem_original_require'", "/usr/local/lib/ruby/site_ruby/1.8/rubygems/
custom_require.rb:27:in `require'", "/usr/local/lib/ruby/gems/
1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:in
`re quire'", "/usr/local/lib/ruby/gems/1.8/gems/
activesupport-1.4.2/lib/active_support/dependencies.rb:342:in
`new_c onstants_in'", "/usr/local/lib/ruby/gems/1.8/gems/
activesupport-1.4.2/lib/active_support/dependencies.rb:495:in
`require'", "script/server:3"]
[2007-03-16 22:25:14] ERROR `/system/configure' not found.
76.185.11.158 - - [16/Mar/2007:22:25:13 CDT] "GET /system/configure
HTTP/1.1" 404 292