Why can't i sign-in in the "daily sign-in event"??

[suiChiken]

good day GM's... i'm just asking why i can't sign-in in the "daily sign-in" event??

it says that "Requires Sign-in Count be 15/15 or below" ??

[nubheals]

That event can only be done 15 times (or in other word, you can only sign in for 15 days). After all 15 attempts are used up, you can't do the daily sign-in anymore.