RMAN-06438: error executing package DBMS_RCVMAN in TARGET database

Recovery Manager requires the DBMS_RCVMAN package in the SYS schema of the indicated database. Normally this package is installed during database creation. To re-create the package, run the files dbmsrman.sql and prvtrmns.plb.

$ sqlplus / as sysdba

SQL> @?/rdbms/admin/dbmsrman.sql
SQL> @?/rdbms/admin/prvtrmns.plb