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Welcome to the King Community.
According to your screenshot, I think it is an app error i.e. your app has been corrupted. Since you did not get the solution through the troubleshooting steps mentioned, you will probably get the solution by uninstalling and reinstalling the app.
For uninstalling the app you will lose all the stored boosters. Also you can contact our player support before uninstall the game app if they can give you some solution.
Thanks!