ORA-16617: unknown object identifier specified in request
Cause : The Data Guard broker returned this error because the object identifier specified in the request was invalid or unknown. For example, this error is returned if an invalid or unknown database object identifier is specified in a request that requires a database object identifier.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Verify that a valid object identifier was specified in the request and then reissue the request.
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.