ORA-27064: cannot perform async I/O to file
Cause : internal error, asked to perform async I/O when IOV indicates that it cannot be performed on the file
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
check for trace file and contact Oracle Support
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.