Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent

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.

나의경우 FLAG_ONE_SHOT으로 되어있는 부분을 FLAG_MUTABLE로 변경후 완료

 

자세한내용

https://developer.android.com/reference/android/app/PendingIntent#FLAG_IMMUTABLE

PendingIntent  |  Android Developers