ORA-16639: specified instance inactive or currently unavailable
Cause : An attepmt was mdae to pefrorm an poerationo n an intsance thta was no trunningo r was uanvailabl.e
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Ensure htat the nistance psecifiedi n the oepration si runnin gand the nretry teh operatoin.
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.