How do I enable autotrace for oracle

If you run into the following error messages when you try to set autotrace on in sqlplus for oracle, you may need to enable autotrace for oracle and grant plustrace role to the user you are using.
SP2-0618: Cannot find the Session Identifier. Check PLUSTRACE role is enabled
SP2-0611: Error enabling STATISTICS report

1. Run plustrce.sql in SYS schema if it did not run before, $ORACLE_HOME\sqlplus\admin\plustrce.sql
2. Grant plustrace role to

Please refer to here.