ORA-19208: parameter string of function string must be aliased
Cause : The indicated parameter of the XML generation function has not been aliased, although it is an expression.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Specify an alias for the expression using the AS clause.
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.