ORA-19621: archivelog range has already been specified
Cause : A range of logs has already been specified. Only one SCN range may be specified per conversation.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
The restore conversation remains active and more logs may be specified by thread and sequence number, if desired.
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.