Warning: Unsupported declare 'strict_types' in C:\Apache24\htdocs\drupal\core\modules\package_manager\src\Event\PostCreateEvent.php on line 3

Fatal error: Class 'Drupal\package_manager\Event\StageEvent' not found in C:\Apache24\htdocs\drupal\core\modules\package_manager\src\Event\PostCreateEvent.php on line 10