Ruby on Rails: not authorized to access sign up page?

Ruby on Rails: not authorized to access sign up page?

I have devise and CanCan set up, but I'm trying to get into sign up page
in my rails application, but its redirecting me to home page saying that
I'm not authorized to access this page.
I have a custom registration controller:
class Devise::RegistrationsController < DeviseController
before_filter :check_permissions, :only => [:new, :create, :cancel]
skip_before_filter :require_no_authentication
def check_permissions
authorize! :create, resource
end
def edit
@user = User.find(current_user.id)
@profile = Profile.new
end
def update
# required for settings form to submit when password is left blank
if params[:user][:password].blank? &&
params[:user][:password_confirmation].blank?
params[:user].delete(:password)
params[:user].delete(:password_confirmation)
end
@user = User.find(current_user.id)
if @user.update_attributes(params[:user])
set_flash_message :notice, :updated
# Sign in the user bypassing validation in case his password changed
sign_in @user, :bypass => true
redirect_to after_update_path_for(@user)
else
render "edit"
end
end
protected
def after_update_path_for(resource)
user_path(resource)
end
private
end
It has something to do with before_filter :check_permissions,... because
when I delete this line, I get an error saying
undefined method `user_registration_path'
from my registration form in my `devise/registrations#new:
<%= form_for(resource, :as => resource_name, :url =>
registration_path(resource_name)) do |f| %>
How do I fix my registration form?
Also, this is my routes:
devise_for :user, :controllers => { :registrations => "registrations" },
:skip => [:registrations, :sessions] do
get 'signup' => 'devise/registrations#new', :as => :new_user_registration
end