ORA-14452: attempt to create, alter or drop an index on temporary table already in use
Cause : An attempt was made to create, alter or drop an index on temporary table which is already in use.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
All the sessions using the session-specific temporary table have to truncate table and all the transactions using transaction specific temporary table have to end their transactions.
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.