ORA-16532: Data Guard broker configuration does not exist
Cause : A broker operation was requested that requires an already existing broker configuration.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Create a Data Guard broker configuration prior to issuing other requests.
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.