Rails - Aug 2006 - `const_missing'': uninitialized constant

Hi all,
still the same error, when accessing my model childs on the site5 server 
....(Person.infogroups.first.infoattributes, (a Person has_many 
infogroup which has_many info_attribute))

I double check my config and the server  and it is exactly the same 
(except for rubygem which is for me 0.8.11).

==>>ERROR
usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:100:in
`const_missing'': uninitialized constant

Is it a rails bug ?
thanks

arnaud

site5 config:
---------------

Ruby version                 1.8.4 (i386-linux)
RubyGems version             0.8.10
Rails version                1.1.6
Active Record version        1.14.4
Action Pack version          1.12.5
Action Web Service version   1.1.6
Action Mailer version        1.2.5
Active Support version       1.3.1
Application root             
/home/contactu/apps/contact-up/releases/20060817190438
Environment                  development
Database adapter             mysql
Database schema version      7