When making some backup tasks (import or Export) on oracle 10g, 11g (for example), you can get a message error:
ORA-20446: The owner of the job is not registered ORA-06512: at “SYSMAN.MGMT_JOBS”…
Solution
Open CMD
C:\>Set oracle_sid= SID_OF_THE_DATABASE
C:\>sqlplus
username: SYSMAN
password: ****
SQL>execute MGMT_USER.MAKE_EM_USER(‘USERNAME’);
USERNAME – the user that you use to connect to enterprise managert
don’t copy/past the command, sometimes they are some hidden characters