ORA-16555: the Data Guard database is not active
Cause : An operation was attempted on a database that is currently not active (off path).
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Verify that the database is active.
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.