ORA-23432: master site string already exists
Cause : An attempt was made to instantiate a replicated object group at a master site that was already a part of the object group.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
If you were trying to add this site, do nothing because it already exists; otherwise, pick the name of another site, and re-run the routine.
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.