NoMethodError: undefined method `error_div_element'

[mark lane]

Hi 

I am getting an undefined method error when calling an error handling module and can't work out why. Any help would be greatly appreciated!

My Scenario:

Scenario: Name is a required field
  When I checkout leaving the name field blank
  Then I should see the error message "Name can't be blank"

My Test Steps:

When(/^I checkout leaving the name field blank$/) do
  on(HomePage).select_puppy
  on(DetailsPage).add_to_cart
  on(ShoppingCartPage).proceed_to_checkout
  on(CheckoutPage).checkout('name' => '')
end

Then(/^I should see the error message "([^"]*)"$/) do |msg|
  expect(@current_page.error.messages).to include msg
end

My Page Object:

require_relative 'error_panel'

class CheckoutPage

  include PageObject
  include DataMagic


  page_section(:error, ErrorPanel, id: 'error_explanation')
  text_field(:name, id: "order_name")
  text_area(:address, id: "order_address")
  text_field(:email, id: "order_email")
  select_list(:pay_type, id: "order_pay_type")
  button(:place_order, value: "Place Order")


  def checkout(data = {})
    populate_page_with data_for(:checkout_page, data)
    place_order
  end

end

My Module:

class ErrorPanel
  include PageObject

  unordered_list(:messages) do |page|
    page.error_div_element.unordered_list_element
  end
end

The error when run:

NoMethodError: undefined method `error_div_element' for #<Watir::HTMLElement: located: false; {:id=>"error_explanation"}>

./features/support/pages/error_panel.rb:5:in `block in <class:ErrorPanel>'

./features/step_definitions/adopting_puppy_steps.rb:87:in `/^I should see the error message "([^"]*)"$/'

./features/adopting_puppies.feature:73:in `Then I should see the error message "Name can't be blank"'