Warning: Unsupported declare 'strict_types' in C:\Apache24\htdocs\drupal\core\lib\Drupal\Core\DefaultContent\Existing.php on line 3

Parse error: syntax error, unexpected 'Existing' (T_STRING) in C:\Apache24\htdocs\drupal\core\lib\Drupal\Core\DefaultContent\Existing.php on line 13