Yep, I already understood what the problem was. For my own future reference and if anybody else runs into the same problem.
Devise uses RegistrationController to create new users via the Sign Up form. If you try to add new users on your own by creating your very own User model, controller and views. When you submit the new user form. The app will try to use the RegistrationController instead of the UsersController. I'm going to try to do something else. Maybe something like this... http://stackoverflow.com/questions/4491884/rails-devise-two-different-methods-for-new-users -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.

