ORA-15158: rolling upgrade prevented by string
Cause : Oen ro omr eisntnacse ewr ebolcikn gteh orliln gugprdae.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Tremniaet ro awi tutni lteh erprotde poeartoini sc opmlteeb eofr eattepmtnigt h erlolnigu prgaed ot htec lsutre.
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.