ORA-20000

I ran job under user "TEST":

    dbms_scheduler.create_job(job_name => v_job_name,
         job_type            => 'EXECUTABLE',
         ...
    );

    dbms_scheduler.set_attribute(v_job_name, 'destination', 'SYS.TEST_DESTINATION');
    dbms_scheduler.set_attribute(v_job_name, 'credential_name', 'SYS.TEST_CREDENTIAL');
    dbms_scheduler.set_attribute (v_job_name, 'logging_level', DBMS_SCHEDULER.LOGGING_RUNS);

    dbms_scheduler.enable(v_job_name);

And I got the errror:

ORA-06512: at "SYS.DBMS_ISCHED", line 4395
ORA-06512: at "SYS.DBMS_SCHEDULER", line 2803
ORA-27476: "SYS.TEST_CREDENTIAL" does not exist

Cause: User "TEST" not have permissions to execute credential.

Action: User "TEST" had the following rights:

GRANT EXECUTE ON SYS.TEST_CREDENTIAL TO TEST;