ORA-31521: CDC subscription string already subscribes to publication ID string column string
Cause : A Change Data Capture subscription intended for import already subscribed to a published column.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Either verify that the existing subscription has the desired characteristics or drop the existing subscription and perform the import again.
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.