ActionView::Template::Error (undefined method `emails_path' for

I am making simple email registration form in rails but I stuck in this error.

I have generate controller Emails and Model Email with only email field in Email Model.

here is my controller with method new

class EmailsController < ApplicationController
 def new
  @email = Email.new
  end
end

below is my view which is very simple

<h2>Register Email</h2>

<% form_for(@email) do |f| %>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
 </div>
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<% end %>

Now I have defined the routes using rake routes

which was working fine until I added code in controller and html page

In routes.rb I defined path for root as this

root 'emails#new'

and my rake routes looks like this

       emails_new GET    /emails/new(.:format)             emails#new
       home_index GET    /home/index(.:format)             home#index
       root GET    /                                 emails#new

Now I get this error

   ActionView::Template::Error (undefined method `emails_path' for   #<#<Class:0x007f25edc36a58>:0x007f25edc4ffa8>):
  App 4103 stderr:     1: <h2>Register Email</h2>
   App 4103 stderr:     2: 
App 4103 stderr:     3: <% form_for(@email) do |f| %>
App 4103 stderr:     4:   <div class="field">
App 4103 stderr:     5:     <%= f.label :email %><br />
App 4103 stderr:     6:     <%= f.text_field :email %>
App 4103 stderr:   app/views/emails/new.html.erb:3:in `_app_views_emails_new_html_erb___4438819380742713977_69900439838140'

any help thanks