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If you recently changed the time on the device to be far in the past, this is likely the reason, set the time ahead as far as you can on your device, this might fix this.
If this does not work, then go here for some glitches that can really help you out https://community.king.com/en/candy-crush-saga/discussion/389950/2-useful-candy-crush-glitches-that-i-know-of#latest