How to get a create a script from dbms_advisor.create_file

Hi
I Used the dbms_advisor.tune_mview to get the tuned materialised view.
I can see the task number and the query it generated.But i want to have it in a text file.So i try to implement the dbms_advisor.create_file package
i have a directory /export/home for which i have access to it
so i gave
exec dbms_advisor.create_file(dbms_advisor.get_task_script('task_5'),'/export/home','mview.txt')
But when i ran this,it gave me invalid directory path error
can you help me in this

Oracle is expecting the Database Directory name instead of the OS Directory path.
You need to create the directory as Database Directory. Then use the Database Directory name in the exec command instead of the full OS directory path.
e.g
SQL>create or replace directory my_db_dir as '/export/home';
SQL>exec dbms_advisor.create_file(dbms_advisor.get_task_script('task_5'),'my_db_dir','mview.txt');

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