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RMAN-03014: implicit resync of recovery catalog failed
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20035: invalid high recid
Also, we were moving our RMAN catalog from one database to another database to resolve another performance issue. So, it might be due to sync issue.
Solution to that was to un-register the database from RMAN catalog and re-register.
More on this topic/issue in metalink id#273446.1
Note, you can unregister using dbms_rcvcat.unregisterdatabase procedure also but I am showing what I did.
Connect to your RMAN catalog as how you generally do take your db backup and run:
RMAN> unregister database;