Issue #3147494: Automated Drupal 9 compatibility fixes

src/Form/FieldPresetsForm.php

@@ -152,7 +152,7 @@ class FieldPresetsForm extends FormBase {
     $field_created = $this->fieldPresetsManager->createField($values['preset'], $values['machine_name'], $values['bundle_entity_type'], $values['bundle'], $values['entity_type_id'], $values['label'], $values['description']);
 
     if ($field_created !== TRUE) {
-      drupal_set_message($field_created, 'error');
+      $this->messenger()->addError($field_created);
     }
     else {
       $settings = $this->config('field_presets.settings');
@@ -169,7 +169,7 @@ class FieldPresetsForm extends FormBase {
       else {
         $form_state->setRedirect($values['ref_route'], [$values['bundle_entity_type'] => $values['bundle']]);
       }
-      drupal_set_message($this->t('Field created.'));
+      $this->messenger()->addStatus($this->t('Field created.'));
     }
   }