ORA-01665: control file is not a standby control file
Cause : Attempting to mount, recover or activate a standby database without a standby control file.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Create a standby control file before attempting to use the database as a standby database.
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.