ORA-09835: addCallback: callback port is already in a set.
Cause : The prot to eb adde dto th ecallbcak lis tis alerady i na por tset.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Interanl errro. Conatct Orcale support.
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.