Rails - Mar 2007 - undefined method `subclasses' error

hi, I moved up from rails 1.1.6 to 1.2.3 and now i get this error:

Processing ApplicationController#login (for 74.193.67.252 at 2007-03-22
18:04:47) [GET]
  Session ID: 3cf7c4e3edc74e0912bf74c9e309750a
  Parameters: {"action"=>"login",
"controller"=>"account"}


NoMethodError (undefined method `subclasses'' for #<Set: {User,
Coach}>):
   
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/symbol.rb:10:in
`__send__''
   
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/symbol.rb:10:in
`to_proc''
   
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/inflector.rb:250:in
`map''
    /usr/lib/ruby/1.8/set.rb:189:in `each''
    /usr/lib/ruby/1.8/set.rb:189:in `each_key''
    /usr/lib/ruby/1.8/set.rb:189:in `each''
   
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/enumerable.rb:42:in
`map''
   
/usr/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/enumerable.rb:42:in
`sum''
   
/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/observer.rb:170:in
`observed_subclasses''
   
/usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/observer.rb:149:in
`initialize''
    /usr/lib/ruby/1.8/singleton.rb:95:in `new''
    /usr/lib/ruby/1.8/singleton.rb:95:in `instance''
   
/usr/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/action_controller/deprecated_dependen



Any ideas? Thanks.

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I also moved up from 1.2.2 to 1.2.3, however when I start the server (or 
even script/about) I have this error:

/opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2.6552/lib/active_support/core_ext/module/aliasing.rb:31:in
`alias_method’: undefined method `load_plugin’ for class 
`Rails::Initializer’ (NameError)

Rails 1.2.2 with ActiveSupport 1.4.1 works fine, but when I want to have 
ActiveResource, I need at least 1.2.3 and 1.4.2 that don’t start in 
proper way.

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