tells me to log into FB to receive the boosters earned after collecting required sugar candies.

Becky_Buck

I am logged into FB but the game tells me to log into FB to receive the boosters earned after collecting required sugar candies

StuckInATree

If your game is already logged into Facebook then you should try logging out and reconnecting it again, I've had that in the past and it solved it for me. Hopefully will be the same for you.