RMAN-06429: TARGET database is not compatible with this version of RMAN RMAN-06618: RMAN client and database version mismatch; indicated database version is 12.1.0.2

Cause:

When duplicate a database from target to auxiliary,there is a version mismatch in rman client version of auxiliary database

Solution:

Upgrade your catalog on your target database

RMAN> upgrade catalog;

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