ORA-13604: The specified parameter string cannot be fetched as a SQL table.
Cause : The user attempted to retrieve a non-table parameter as a table name.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check the datatype for the task parameter and retry the operation.
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.