Oracle Solution for Error ora-19915

ORA-19915: unable to encrypt pre-10.2 files

What triggered the Error:

RMAN encrypted backup was requested, but this backup includes one or more archived logs that were generated by an older release of Oracle. These archived logs cannot be encrypted.

What should we do to fix it:

ck up the older logs without encryption. Logs created with Oracle release 10.2 and greater can be encrypted.