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Hi and Welcome to the King Community
Please dont uninstall your game you will be lose your booster . make sure force close the apps and Log in again . and If you miss a reward from any other feature, please report this to our Player Support Team here and tell your Game ID there.
The screen shots are from all stats features and there are no rewards given from those.
Can't you just click the "X" button and retry collecting the reward?
As mentioned by the green man above, this message is safe to ignore. I personally have only seen it when trying to open the weekly contest. I simply dismiss the message and immediately reopen the event. It then loads as normal.
I'd suggest giving the choco box a little time before claiming it. You can even restart the game beforehand, then wait a minute before claiming.
Good luck! 👍