DataPump: UDE-00008 ORA-31626 ORA-39086

The following errors occur when exporting data by using DataPump:

UDE-00008: operation generated ORACLE error 31626
ORA-31626: job does not exist
ORA-39086: cannot retrieve job information
ORA-06512: at "SYS.DBMS_DATAPUMP", line 2772
ORA-06512: at "SYS.DBMS_DATAPUMP", line 3886
ORA-06512: at line 1

Check the log which shows exporting has been successful.

...
..
.
Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is:
C:\TEMP\TEST.DMP
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 12:08:38

So it is a bug, and this error can be ignored.