NoMethodError in Devise::Registrations#new - ruby-on-rails

Question

I keep getting this error when I try to sign up on my application, I am using devise for authentication;
NoMethodError in Devise::Registrations#new
undefined method `registration_path' for #<#<Class:0x007fe45c6c35e8>:0x007fe45d9ffd78>
Extracted source (around line #3):
<h2>Sign up</h2>
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div><%= f.label :email %><br />
When I run rake routes I get;
Prefix Verb URI Pattern Controller#Action
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
Sign up link code;
<%= link_to "Sign up", new_user_registration_path%>
UPDATE
Thanks to ParaPenguin the sign up field works now, but when I click submit I keep getting this problem
No route matches [POST] "/users/sign_up"
new_user_session_path GET /users/sign_in(.:format) devise/sessions#new
user_session_path POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session_path DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password_path POST /users/password(.:format) devise/passwords#create
new_user_password_path GET /users/password/new(.:format) devise/passwords#new
edit_user_password_path GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration_path GET /users/cancel(.:format) devise/registrations#cancel
user_registration_path POST /users(.:format) devise/registrations#create
new_user_registration_path GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration_path GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format)
Update 2-Gjaldon asked me to include my user model and routes
My user model
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
Routes.rb
Document::Application.routes.draw do
devise_for :users
root "pages#home"
get "about" => "pages#about"
get "prices" => "pages#prices"
get "faq" => "pages#faq", :as => :faq
get "terms" => "pages#terms"
get "view" => "pages#view"
get "policy" => "pages#policy"
get "contact" => "pages#contact"
get "works" => "pages#works"

Answer 1

Could you provide your routes for Devise in your routes.rb and the devise code for your User model?
It's either one of the following that might fix your problem:
Restart your Rails server. This way, Rails will see the new files and changes Devise has made to Rails.
Did you override the Devise::Registrations#new action? If so, you will need to replace your view code below:
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
with:
<%= form_for(resource, :as => resource_name, :url => user_registration_path) do |f| %>
In your devise_registrations/edit.html.erb view, your form_for code would look like:
<%= form_for(resource, :as => resource_name, :url => edit_user_registration_path(resource_name, :method => :put) do |f| %>
Your rake routes actually provides you with the routes you need to submit to. Just keep in mind that the corresponding controller and action is displayed under the Controller#action column in the output of rake routes. The form in edit action should always submit to the update action and the form in new action should always submit to the create action if you stick to the Rails conventions. If you decide to have a form in another action for creating a record, then make sure to have the form submit to the create action.

Answer 2

Try changing registration_path(resource_name) from
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
to new_registration_path(resource_name). This could fix the error but I am not certain, it's possible. It seems that it is only for you as that file setup runs just fine for my devise.