Tuning MVs in 10g

Question

I'm trying to run the following packages:
task_name is a varchar2 and sqlstmt is the query explicitly defined when calling the package.
dbms_advisor.TUNE_MVIEW(task_name, sqlstmt);
dbms_advisor.create_file(dbms_advisor.GET_TASK_SCRIPT(task_name),'WORK_DIR','mv_tuning.sql');
But I keep getting the following error messages:
ORA-13600: error encountered in Advisor
QSM-03113: Cannot tune the MATERIALIZED VIEW statement
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.PRVT_ACCESS_ADVISOR", line 202
ORA-06512: at "SYS.PRVT_TUNE_MVIEW", line 1075
ORA-06512: at "SYS.DBMS_ADVISOR", line 754
ORA-06512: at line 5
The create MV statement has been taken from a script that will create a mv so I know that it works. I've tried the dbms_mview.explain_mview using the same script and it works fine.
Does anyone have any ideas where I can go from here?
Regards

Answer 1

The first parameter to tune_mview is an IN OUT parameter. I don't see, in your code, where you have provided any ability for the OUT.
Compare what you've posted to my working demo in Morgan's Library under DBMS_ADVISOR.
http://www.psoug.org/reference/dbms_advisor.html