ORA-28154: Proxy user may not act as client 'string'

Cause : A proxy user may not assume the identity of a privileged user in order to limit the privileges that a proxy may possess.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Execute the statement again specify a client other than a privileged user.

update : 26-09-2017
ORA-28154

ORA-28154 - Proxy user may not act as client 'string'
ORA-28154 - Proxy user may not act as client '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.