ORA-16803: unable to query a database table or fixed view
Cause : Failed to query a database table or fixed view. The database may not be open or mounted.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check Data Guard broker log for more details.
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.