ORA-13768: Snapshot ID must be between string and string.
Cause : The user attempted to select data from the workload repository using a snaphot ID which does not exist.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Adjust the snapshot ID and retry the 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.