ORA-12334: database (link name string) is still open
Cause : You attempted to dismount a database that is still open.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Close the database with the ALTER 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.