Thanks to the contributor for High Five fixing, there is no error.
But the problem is I can't see Gifts at my Admin panel. I do see it at the profile page, though, but no way to send any. Under the gifts tab on profile page it says: You still don't have any gift yet!
By the way, is it OK with the grammar here? So, still or yet? Shouldn't be one or another, not both, I guess.
Otherwise it is a wonderful plugin.
I use WP 3.2.1 & WP 1.2.9