ORA-24415: Missing or null username.

Cause : Username and password must be specified when pool is created in this mode.

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

Specify a valid username and password.

update : 23-05-2017
ORA-24415

ORA-24415 - Missing or null username.
ORA-24415 - Missing or null username.

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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.