ORA-13624: The task string is executing and cannot be deleted or modified.

Cause : The user attempted to access a task that currently executing.

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

Wait for the task to complete and retry the operation.

update : 22-09-2017
ORA-13624

ORA-13624 - The task string is executing and cannot be deleted or modified.
ORA-13624 - The task string is executing and cannot be deleted or modified.

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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.