Uninitialized constant

I’m using devise, wich works fine, now I try to use devise_invitable.
I installed it correctly, but I’m getting the error when I try to access


The error is:

Started GET “/users/invitation/new” for at 2011-07-06 20:47:07

ActionController::RoutingError (uninitialized constant Users):

within rescues/layout (1.9ms)

The routes looks like ok, and I dont know why it return this error.

Fernando A.