ORA-27473: argument string does not exist
Cause : An argument which was specified does not exist.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Reissue the command using an argument name defined by the program or using a valid argument position.
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.