ORA-12322: unable to mount database (link name string)
Cause : This message should be accompanied by additional error messages that indicate the cause of the problem.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Follow the steps outlined in the accompanying error messages to resolve the problem.
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.