RMAN Register Database : RMAN-03014 RMAN-03009 ORA-01403

The following errors occur while registering the database in RMAN into RMAN catalog:

RMAN> register database;

starting full resync of recovery catalog
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of register command at 07/16/2021 15:39:33
RMAN-03014: implicit resync of recovery catalog failed
RMAN-03009: failure of full resync command on default channel at 07/16/2021 15:
ORA-01403: no data found