ORA-38730: Invalid SCN/TIMESTAMP expression.

Cause : The expression supplied in a FLASHBACK DATABASE command was invalid.

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

Retry the command using a valid number or time stamp expression.

update : 24-06-2017
ORA-38730

ORA-38730 - Invalid SCN/TIMESTAMP expression.
ORA-38730 - Invalid SCN/TIMESTAMP expression.

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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.