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NameError in Users#new

Showing /Users/tyrant505/Sites/rails/sample_app/app/views/layouts/_header.html.erb where line #13 raised:

undefined local variable or method `signin_path' for #<#<Class:0x000001028d5380>:0x000001028d0d80>
Extracted source (around line #13):

10:       <% if signed_in? %>
11:       <li><%= link_to "Sign out", signout_path, :method => :delete %></li>
12:       <% else %>
13:       <li><%= link_to "Sign in", signin_path %></li>
14:       <% end %>
15:     </ul>
16:   </nav>


module SessionsHelper
        def sign_in(user)
                cookies.permanent.signed[:remember_token] = [user.id, user.salt]
                current_user = user
        end
  def current_user=(user)
    @current_user = user
  end

  def signed_in?
    !current_user.nil?
  end
  def sign_out
    cookies.delete(:remember_token)
    self.current_user = nil
  end
        private
                def user_from_remember_token
                  User.authenticate_with_salt(*remember_token)
                end
                def remember_token
                  cookies.signed[:remember_token] || [nil, nil]
                end
end