java.lang.IllegalArgumentException: com.entitcs.office_attendance: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles. at android.app.PendingIntent.checkFlags(PendingIntent.java:375) at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:464) at android.app.PendingIntent.getActivity(PendingIntent.java:444) at android.app.PendingIntent.getActivity(PendingIntent.java:408) at com.entitcs.office_attendance.FirebaseClassess.FCMMessageReceiverService.q(Unknown Source:563) at com.entitcs.office_attendance.FirebaseClassess.FCMMessageReceiverService.g(Unknown Source:86) at com.google.firebase.messaging.FirebaseMessagingService.e(Unknown Source:377) at com.google.firebase.iid.k0.run(Unknown Source:24) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637) at com.google.android.gms.common.util.o.c.run(Unknown Source:6) at java.lang.Thread.run(Thread.java:1012)