ORA-19851: OS error while managing auxiliary database string
Cause : An OS error was received while managing the automatic auxiliary instance.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check the accompanying errors.
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.