ORA-25248: duplicate agent specified in the agent list
Cause : An agent was specified more than once in the agent list of the LISTEN call.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Remove the duplicate agent specification(s), and retry the call.
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.