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Hi thank you for posting.
It could be that the graphics card in your device isn't coping well, but can you try this troubleshooting here. If its not a pc, can you let me know and I will get you the appropriate link.
https://care.king.com/en/candy-crush-saga/cant-get-your-games-to-load-on-facebook-check-this-out
Can you also let me know the device/OS
and if its a mobile or tablet, available free memory.
Thank you