why I can not create new record in rails? : I try to create new moderator, but it always show error like below:
NoMethodError in Admin::Moderator#new
undefined method `admin_moderators_path' for #<#<Class:0x607ce90>:0x907a0d0>
Did you mean?  admin_moderator_path,
               admin_moderator_index_path,
               admin_moderator_url
## index.erb ##

    <%= link_to 'add new user', new_admin_moderator_path %>

## Routes.rb ##

    namespace :admin do
        resources :moderator
      end 

## moderator_controller.rb ##

     def new
       @moderator = Moderator.new
     end
     def create
       @moderator = Moderator.new(moderator_params)
       if @moderator.save
         redirect_to admin_moderator_index_url
       else
         render 'new'
       end
     end
    
     private
       def moderator_params
            params.require(:moderator).permit(:id, :fullname, :username, :password)
       end

## new.erb ##

    <h1>Create new</h1>
    <%= form_for [:admin , @moderator] do |u| %>
        <p>
            <%= u.lable :fullname %>
            <%= u.text_field :fullname %>
        </p>
        <p>
            <%= u.lable :username %>
            <%= u.text_field :username %>
        </p>
        <p>
            <%= u.lable :password %>
            <%= u.password_field :password %>
        </p>
        <p>
            <%= u.submit %>
        </p>
    <% end %>
