ORA-00021: session attached to some other process; cannot switch session

Cause : The user session is currently used by others.

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

Do not switch to a session attached to some other process.

update : 26-09-2017
ORA-00021

ORA-00021 - session attached to some other process; cannot switch session
ORA-00021 - session attached to some other process; cannot switch session

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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.