Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
Have you tested another browser? Is your java up to date? I am not sure if it will help with this particular error message but I know that King made this video to help with general problems with the games on Facebook it might help you as well:
https://www.youtube.com/watch?v=OESCE4Jj2tU
If this does not work then it could just be a problem with Facebook at the moment. I think all the games are working fine on mobile devices so you can play there while you wait.