ORA-16771: failover to a physical standby database failed
Cause : In the failover operation, the step of converting the physical standby database to the primary database failed.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check the alert log and the Data Guard broker log for more details about the error.
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.