Fatal error: Uncaught Error: Class "Flarum\Api\Serializer\AbstractSerializer" not found in /usr/home/seoulsource/domains/kgaeul.web.id/public_html/vendor/flarum/flags/src/Api/Serializer/FlagSerializer.php:18
Stack trace:
#0 {main}
  thrown in /usr/home/seoulsource/domains/kgaeul.web.id/public_html/vendor/flarum/flags/src/Api/Serializer/FlagSerializer.php on line 18