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I have had this problem before. If you have recently changed your Facebook password, this needs to be updated on your device as well. To do this, please remove the connection to Facebook via the settings menu in the game, log out from Facebook on your device, and then connect again with your new password.
Shut down the game and start it again.
Try to connect to a WiFi connection instead of using your cellular data
Here are two useful videos that will show you how to perform these steps depending on the device you are using:
https://www.youtube.com/watch?v=bIYE7aW5jcE
Let us know how you get on with these videos