[indo-oracle] 'PLAN_TABLE' is old version

[Andes Febrian]

Dear gurus,

ketika menjalankan explain plan, muncul message 'PLAN_TABLE' is old version.
kemudian cari2 di inet, di suruh drop table dan jalankan perintah
utlxplan.sql, tp ketika jalankan drop table error keluar :

SQL> conn / as sysdba
Connected.
SQL> drop table plan_table;
drop table plan_table
           *
ERROR at line 1:
ORA-00942: table or view does not exist

please help,
Many Thanks