ORA-25327: Array size is invalid
Cause : Array size must be a positive, non-zero integer.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Use corrected array size and retry array operation.
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.