@brendasleeper, if this is a recent thing (last couple of days), then you are having same problem as others.
It has to do with new friends on your list, someone or more than one, that you recently became friends with and had never gifted before.
Hopefully Rovio will fix soon, it started Friday, around the time of update.
If you know who they are, you can UNcheck their names, and try to gift as usual. If you have mobile application of the game, you can still gift those. After gifting everyone else as usual, go into mobile game app, go to Inbox, Send Free Gifts. At the top of page, enter names one by one, clicking on them and then clicking send in upper right corner. Repeat until all are sent.
To double-check, go back into browser, FB, the game… Inbox, Send Free Gifts and make sure they were sent.
Remember though, gifts reset daily 0:00GMT.
Hope that helps.