drupal-media / entity_embed

        if ($uuid = $entity->uuid()) {

          $form_state->setValueForElement($form['attributes']['data-entity-uuid'], $uuid);

        }

        else {

          $form_state->setError($form['attributes']['data-entity-id'], $this->t('Cannot embed @type entity @id because it does not have a UUID.', array('@type' => $entity_type, '@id' => $id)));

        }

        // Ensure that at least one Entity Embed Display plugin is present

        // before proceeding to the next step. Rasie an error otherwise.

        }

      }

    }

    else {

      $form_state->setError($form['attributes']['data-entity-id'], $this->t('Unable to load @type entity @id.', array('@type' => $entity_type, '@id' => $id)));

    }

  }

  /**