Getting unknown error, FLAG_IMMUTABLE

I am getting this error: 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.
Note: You will not see another error reported for 5 seconds
can anyone tell how to fix it??

You are probably using an extension that has not been updated (a community search would have returned you many similar questions)

Ok thanks