I back up the database using command
RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE PLUS ARCHIVELOG;
Then during the installation, got this error
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 4 found to restore
RMAN-06023: no backup or copy of datafile 3 found to restore
I then check for the missing datafile using command
RMAN> list backup of datafile 3 summary;
specification does not match any backup in the repository
I've checked online for solution, but none of them works