Overriding SessionsControllers is not loggin in - ruby-on-rails-3

Question

I want to add OpenID authentication in my web. To do that I have follow several tutorials and used several plugins and gems and finally I manage to do something with devise_openid_authenticatable gem. I also have normal login/password authentication, Facebook authentication and Twitter authentication. Those three work perfectly.
Now I'm trying to override Devise's Session Controller , but when I do it, the normal login/password stops working. The error I get is:
ActiveRecord::RecordNotFound in Sessions#create
Couldn't find User without an ID
The rest of the authentication forms work OK, even the sign up works perfect. It's only the login/password authentication method...
I use Rails 3.0.1, Ruby 1.8.9 and Devise 1.4.9
routes.rb
MAWeb::Application.routes.draw do
[...]
devise_for :admins
devise_for :users, :controllers => {:registrations => 'registrations', :sessions => 'sessions'}
match '/users/openid' => 'users#openid_sign_in'
match 'openid/sign_in' => 'openid#sign_in', :as => :openid_sign_in
get 'openid/create'
match '/auth/:provider/callback' => 'authentications#create'
match '/auth/failure' => 'authentications#failure'
resources :subscription_contact_datas
resources :subscription_preferences do
collection do
post :create_with_params
end
member do
get 'delete_tag'
end
get 'fill_event_id', :on => :member
end
resources :event_states
resources :subscription_profiles do
collection do
put :update_profiles
end
end
resources :event_criteria_options
resources :subscriptions do
collection do
get :options_for_event_criteria
end
end
resources :event_criterias
resources :categories
resources :user_infos do
member do
get 'edit'
end
end
resources :events
resources :users do
member do
get 'showUserActivity'
end
end
resources :admins
resources :subscriptions_from_poi
root :to => "home#index"
namespace :user do
root :to => "users#index"
end
namespace :admin do
root :to => "admins#index"
end
*registrations controller's override works perfectly
EDIT: Added the most of the routes. The ones I omited are not important in my opinion.