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Hello @laq46 and welcome to our wonderful King Community. I am sorry you are having this problem. It is my understanding that there have been some problems with Facebook recently.
You may want to temporarily connect your game to a King.com account to ensure you can save your progress and then try and reconnect thru FB again in a day or two. You can sync both accounts. I can easily switch between the two with my game.
Make sure you have the latest update of the game (it was just recently updated), and you have cleared your cache. Then restart your device and see if that helps.
Try to update and login again to see if it is resolved.