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.

update : 27-05-2017
ORA-16523

ORA-16523 - operation requires the client to connect to instance "string"
ORA-16523 - operation requires the client to connect to instance "string"

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    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.