kind of hard to answer if we don't know the details. what , who and where was the post? Did you already rep it once?
Well, what it means is that you can't give rep to the post, amazingly. And has been said, what post where you trying to rep?
never saw that b4.. I think Sweets is correct.. I am gonna try it! lol.. I tied..can't rep yourself... so it must be that the site hates him!