ORA-13758: "SQL Tuning Set" "string" owned by user "string" is in use.
Cause : The user attempted to modify a SQL Tuning Set or to add a reference to a SQL Tuning Set which is in use.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Wait until the end of the previous operation and retry.
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.