Error message in each backend and frontend pages easysocial 2

Hi,

I upgrade Easysocial and I have this issue on each backend and frontend pages: "Strict Standards: Declaration of SocialUserAppBlog:nNotificationLoad() should be compatible with SocialAppItem:nNotificationLoad(SocialTableNotification &$item) in /home/viiva/testcmonecole/media/com_easysocial/apps/user/blog/blog.php on line 1012"

Have you an idear ?

And to override template, it's same system than for easysocial 1.4 ? I think some files are changed, so I need to look each file override ?

Thank's