ORA-23437: template authorization already exists for user
Cause : The specified user already has been authorized to use the specified refresh group template.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check the values for user name and refresh template name or query the DBA_REPCAT_USER_AUTHORIZATIONS view to ensure that the correct values were passed as 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.