ORA-13644: The user "string" is invalid.

Cause : Invalid user name specified to advisor framework

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

User should specify a correct, case-sensitive, name

update : 22-07-2017
ORA-13644

ORA-13644 - The user "string" is invalid.
ORA-13644 - The user "string" is invalid.

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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.