code: func (e DomainNotFoundError) Error() string {
  	switch {
  	case e.Name != "":
  		return fmt.Sprintf("Domain %s not found", e.Name)
  	case e.GUID != "":
  		return fmt.Sprintf("Domain with GUID %s not found", e.GUID)
  	default:
  		return "Domain not found"
  	}
  }
docs: // Error method to display the error message.