Overrides Drupal\field_ui\OverviewBase::validate().
array $form: An associative array containing the structure of the form.
array $form_state: A reference to a keyed array containing the current state of the form.
Overrides OverviewBase::validate
public function validate(array $form, array &$form_state) {
$this
->validateAddNew($form, $form_state);
$this
->validateAddExisting($form, $form_state);
}