ORA-23448: duplicate user parameter value
Cause : The user parameter value specified by the user name, parameter name and refresh group template name already exists.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Correct the invalid parameter and execute the procedure again. Use the DBA_REPCAT_USER_PARMS view to query the existing user parameters.
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.