The following errors occur when RMAN backup took place:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 08/06/2025 12:38:27
RMAN-03014: implicit resync of recovery catalog failed
RMAN-06004: Oracle error from recovery catalog database: RMAN-20020: database incarnation not set

RESOLUTION

RMAN> reset database;
reset database;
database incarnation already registered