ORA-30959: The indexed column is not stored in CLOB.
Cause : An attempt was made to create an XML Index on an OR-XMLType column.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Re-create the XML Index on a CLOB-XMLType column.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.