在用jUpgrade升级网站，出现了问题，请大家帮看看

就是在用jUpgrade升级网站的时候，出现了Warning: set_time_limit() has been disabled for security reasons in /www/users/fcjtb.com/administrator/components/com_jupgrade/includes/jupgrade.class.php。这样的问题，请问是什么愿意，希望大家解答一下，谢谢！附件有截图。