ORA-32644: this function is not allowed outside of MODEL clause
Cause : A function allowed only within the MODEL clause is used outside of MODEL clause.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Rewrite the SQL statement.
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.