ORA-00028: your session has been killed
Cause : A privileged user has killed your session and you are no longer logged on to the database.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Login again if you wish to continue working.
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.