A copy of ApplicationController has been removed from the module tree but is still active!

[gudata]

Hello,
In development env, when I go to /mongo_admin I can see the first screen with all the models list. But when I choose one model I got

A copy of ApplicationController has been removed from the module tree but is still active!

 /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:414:in `load_missing_constant'
 /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:96:in `const_missing'
 /home/guda/re/app/controllers/application_controller.rb:36:in `current_user_session'
 /home/guda/re/app/controllers/application_controller.rb:41:in `current_user'
 /home/guda/re/app/controllers/application_controller.rb:45:in `require_user'

I suppose that it is an issue with the dynamic class loading but probably you know better.