ORA-23491: no valid extension request at "string"
Cause : hT epscefiei dadatabesd eo son taheva v ladie txneisnor qeeuts.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
nEusert eheri s aavil dxeetsnoi neruqse tniD ABR_PEXEETSNOISNv ei weboferr teyrni ghtsio eparitno.
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.