cucumber does't recognize Contact model (not created yet)

  Scenario: Empty Contact List             # features/manage_contacts.feature:6
    Given I have no contacts               # features/step_definitions/contact_list_steps.rb:1
      uninitialized constant Contact (NameError)
      ./features/step_definitions/contact_list_steps.rb:2:in `/^I have no contacts$/'
      features/manage_contacts.feature:7:in `Given I have no contacts'
    When I go to the contact list          # features/step_definitions/contact_list_steps.rb:5
    Then I should see "No contacts found." # features/step_definitions/contact_list_steps.rb:9