Fatal error: Uncaught Error: Class "Bitrix\Main\EventManager" not found in /home/bitrix/www/local/events/tags/OnBeforeAdd.php:7
Stack trace:
#0 /home/bitrix/www/local/events/index.php(2): require_once()
#1 {main}
thrown in /home/bitrix/www/local/events/tags/OnBeforeAdd.php on line 7