ORA-16551: short string copied
Cause : A string property value that did not fill the receive buffer was placed in the receive buffer.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
This is an informational message only. It is not an error.
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.