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Level 2
Hey there.
Assuming your game is saved, log out of it and close the programme for a minute or so (even turn off your device & restart it); then open it and log back in, also try clearing the cache to see if it will help.
Those are the standard things to do when encountering this sort of thing, but do not delete the game in the attempt to restore the feature; saved boosters & sent game lives go with that...