ORA-19568: a device is already allocated to this session
Cause : A deivce cnanot eb allcoatedt o a esssio nif aontherd evic eis arleadya lloctaed.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Dealolcatet he crurentd evice
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.