For the newly installed Oracle 18C database, the alert log keeps making errors:

ORA-12012: error on auto execute of job

ORA-12012: error on auto execute of job "SYS"."ORA$AT_OS_OPT_SY_222"
ORA-20001: Statistics Advisor: Invalid task name for the current user
ORA-06512: at "SYS.DBMS_STATS", line 49538
ORA-06512: at "SYS.DBMS_STATS_ADVISOR", line 881
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 21631
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 23763
ORA-06512: at "SYS.DBMS_STATS", line 49526
2022-02-28 01:27:20.762000 +08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_j000_104148.trc:
ORA-12012: error on auto execute of job "SYS"."ORA$AT_OS_OPT_SY_224"
ORA-20001: Statistics Advisor: Invalid task name for the current user
ORA-06512: at "SYS.DBMS_STATS", line 49538
ORA-06512: at "SYS.DBMS_STATS_ADVISOR", line 881
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 21631
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 23763
ORA-06512: at "SYS.DBMS_STATS", line 49526
2022-02-28 01:37:21.758000 +08:00
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_j000_104738.trc:
ORA-12012: error on auto execute of job "SYS"."ORA$AT_OS_OPT_SY_226"
ORA-20001: Statistics Advisor: Invalid task name for the current user
ORA-06512: at "SYS.DBMS_STATS", line 49538
ORA-06512: at "SYS.DBMS_STATS_ADVISOR", line 881
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 21631
ORA-06512: at "SYS.DBMS_STATS_INTERNAL", line 23763
ORA-06512: at "SYS.DBMS_STATS", line 49526

Solution:
Call the initialization package manually: go to sqlplus as administrator
1. sqlplus / as sysdba

2. check the current auto task belongs to the user already exists, if not then initialize the package

3. EXEC dbms_stats.init_package();

4. Confirm again

SQL> column name format A35
SQL> set linesize 120
SQL> select name, ctime, how_created from sys.wri$_adv_tasks where owner_name = 'SYS' and name in ('AUTO_STATS_ADVISOR_TASK','INDIVIDUAL_STATS_ADVISOR_TASK');

no rows selected

SQL> EXEC dbms_stats.init_package();

PL/SQL procedure successfully completed.

SQL> select name, ctime, how_created from sys.wri$_adv_tasks where owner_name = 'SYS' and name in ('AUTO_STATS_ADVISOR_TASK','INDIVIDUAL_STATS_ADVISOR_TASK');

NAME                                CTIME     HOW_CREATED
----------------------------------- --------- ------------------------------
AUTO_STATS_ADVISOR_TASK             28-FEB-22 CMD
INDIVIDUAL_STATS_ADVISOR_TASK       28-FEB-22 CMD