admin subdirectory and "No action responded to observations." error

Hi there,

I'm working on a project which uses an admin subdirectory.
So I created an admin controller and every controller in my admin
subdirectory looks like this :
class Admin::FooController << AdminController

I added to my route.rb :

map.namespace :admin do |admin|
    admin.resources :foos
end

and

map.connect 'admin/:controller/:action/:id'

So when I go to the index/show/edit pages it works well, but I have a
form which goes to the search method, but when I press submit, I have
this :

Processing AdminController#foo (for 127.0.0.1 at 2009-08-04 12:30:38)
[POST]

instead of this FooController#search

and I get this error:

Unknown action

No action responded to observations. Actions:

Do you have any idea?
Thank you by advance.

-Yoann