Warning: Declaration of SocialUserAppBlog::onNotificationLoad($item)

Hi,

I tried to upgrade ES in my site to newest version and got this error on both frontend and backend:
Warning: Declaration of SocialUserAppBlog:nNotificationLoad($item) should be compatible with SocialAppItem:nNotificationLoad(SocialTableNotification &$item) in /home/lamgame/public_html/media/com_easysocial/apps/user/blog/blog.php on line 0

Please help.

Thanks,
Anh