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Hi @Mingming31 I'm just a ordinary player not a support but I try to solve your problem. Maybe you can try clear cache ( be careful not data) and also close your device for 10 sec and open back. If still can't maybe you need to check your version is it updated? The last solution is danger but maybe working: uninstall the game and install back ( you will lose all you booster) and then play a level.
I just now remember back that logout your account and login back may working, then play a level. ( Normally the event will come back you can try this I think ).
😊