FORMS_DDL

I need to know which are the privileges for the users to execute:

FORMS_DDL('CREATE DIRECTORY '||vdir||' AS '||CHR(39)||Vdir_archivos||CHR(39)) ;
----code here

FORMS_DDL('DROP DIRECTORY '||vdir||');

This is to manipulate a xml file using DBMS_LOB Package I'm receiving the message ORA-22289. What can it be? Received on Thu Jun 16 2005 - 11:45:53 CDT