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I am altering a paragraphs form to add a validation function to the "Add More" button using this code: [This button add widgets for multiple value fields]

function mymodule_field_widget_paragraphs_form_alter(&$element, FormStateInterface &$form_state, $context) {
  if ($element['#paragraph_type']=='my_parag'){
    if (isset($element['subform']['my_parag_field']['widget']['add_more']['add_more_button_my_parag'])) {
      //Here is the code that adds the validate function
      $element['subform']['my_parag_field']['widget']['add_more']['add_more_button_my_parag']['#validate'] = ['validate_add_more_button'];
    }
  }
}

This handmade validation function is called but I couldn't stop the submit function to be called with $form_state->setError

function validate_add_more_button(array $form, FormStateInterface $form_state){
  //This line has no effect... a new widget is added
  $form_state->setError($form, t("error"));
}

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