Error message
Deprecated function: Drupal\simplenews\Spool\SpoolStorage::getRecipientHandler(): Implicitly marking parameter $edited_values as nullable is deprecated, the explicit nullable type must be used instead in include() (line 571 of vendor/composer/ClassLoader.php).Deprecated function: Drupal\simplenews\Spool\SpoolStorageInterface::getRecipientHandler(): Implicitly marking parameter $edited_values as nullable is deprecated, the explicit nullable type must be used instead in include() (line 571 of vendor/composer/ClassLoader.php).