BackgroundWhile using devise on rails3, I got the following error message.
Couldn't Find User With Id=sign_in Devise on Rails 3It was working yesterday, but not today.
SolutionI checked config/routes.rb, and had
resources :users devise_for :userswhich seemed to be interupting each other.
So I commented out resources :users, and it started to work fine.
I don’t know why it kept working till yesterday…