RMAN-20020: database incarnation not set

usually it happens when you do alter database open resetlogs..

RMAN> resync catalog;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of resync command on default channel at 04/04/2014 05:25:29
RMAN-20020: database incarnation not set

RMAN> reset database;

database incarnation already registered
starting full resync of recovery catalog
full resync complete

RMAN>

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