ORA-12402: invalid format string: string
Cause : The format string is not supported by the policy.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Correct the syntax of the format string.
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.