/**
* {@inheritdoc}
*/
public function validateForm(array &$form, FormStateInterface $form_state)
{
parent::validateForm($form, $form_state);
$id = trim($form_state->getValue('type'));
// '0' is invalid, since elsewhere we check it using empty().
if ($id == '0') {
$form_state->setErrorByName('type', $this->t("Invalid machine-readable name. Enter a name other than %invalid.", array('%invalid' => $id)));
}
}
