Hi all!

Sometimes it may happen due to passed upgrade steps or several reinstallations of the module. To fix this issue you need to apply the following MySQL queries (backup UNA database before):

delete FROM `bx_timeline_handlers` WHERE `group` like 'bx_ads%';

delete FROM `sys_alerts` WHERE `unit` like 'bx_ads%';

delete FROM `bx_notifications_handlers` WHERE `alert_unit` like 'bx_ads%';