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The message indicates that your database is in NOARCHIVELOG mode. You cannot make an RMAN Backup of a database that is OPEN if it is in NOARCHIVELOG mode.
You have two options
1. Make consistent RMAN Backups with the database only in MOUNT mode (SHUTDOWN ; STARTUP MOUNT)
2. Configure for ArchiveLogs (create a target filesystem or FRA), set the database to ARCHIVELOG mode, monitor the volume of ArchiveLog generation, configure both Database and ArchiveLog backups.
Hemant K Chitale