ORA-25002: cannot create INSTEAD OF triggers on tables
Cause : Only BEFORE or AFTER triggers can be created on a table.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Change the trigger type to BEFORE or AFTER.
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.