ORA-39127: unexpected error from call to "EXFSYS"."DBMS_EXPFIL_DEPASEXP" during datapump export

Scenario:

A full database export using both conventional export utility and datapump has so many errors and warnings in their log file.

Conventional Export log


EXP-00008: ORACLE error 6550 encountered
ORA-06550: line 1, column 14:
PLS-00201: identifier 'EXFSYS.DBMS_EXPFIL_DEPASEXP' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
EXP-00083: The previous problem occurred when calling EXFSYS.DBMS_EXPFIL_DEPASEXP.schema_info_exp


Datapump Export log


ORA-39127: unexpected error from call to "EXFSYS"."DBMS_EXPFIL_DEPASEXP"."SYSTEM_INFO_EXP"
ORA-44002: invalid object name
ORA-06512: at "SYS.DBMS_ASSERT", line 316
ORA-06512: at "SYS.DBMS_METADATA", line 9263
Processing object type DATABASE_EXPORT/SYSTEM_PROCOBJACT/PRE_SYSTEM_ACTIONS/PROCACT_SYSTEM
Processing object type DATABASE_EXPORT/SYSTEM_PROCOBJACT/PROCOBJ
ORA-39127: unexpected error from call to "EXFSYS"."DBMS_EXPFIL_DEPASEXP"."SYSTEM_INFO_EXP"
ORA-44002: invalid object name
ORA-06512: at "SYS.DBMS_ASSERT", line 316


Reason: 


EXFSYS schema is missing in the database. To install the EXFSYS schema execute the script "catexf.sql" as SYS user.

Solution:

conn as sysdba and execute


@?/rdbms/admin/catexf.sql


Restart the export now. There would not be similar errors.