NoMethodError at / undefined method page_media' for nil:NilClass

NoMethodError at / undefined method `page_media' for nil:NilClass

indexapp/controllers/homepage_controller.rb

  before_action :set_track_page_status
  def index
     @cms_page     = Page.find_by_content_filename("homepage.en.yml")
     @homepage_cms = HomepageCms.first
     @page_medium  = @cms_page.page_media.order("id ASC")
     @roots        = Category.roots
  end
end

How can I fix this this issue on Ror? The homepage does not load.