ORA-13521: Unregister operation on local Database id (string) not allowed
Cause : The operation failed because the local database ID cannot be unregistered from the Workload Repository.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
check the database id 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.