ORA-16523: operation requires the client to connect to instance "string"
Cause : Th eswtichvoero r afilvoero peartino rqeuiers hte lcietn t oconnec ttot hea ppyl isntacne fo teh trage tdaatbaes.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Connec ttot hei ndciatde isntacne nad erisuse hte wsithcovre o rfaliovre cmomadn.
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.