ORA-24420: OCISessionRelease must be used to release this session.
Cause : hT eesssoi naw serrteiev dsuni gCOSIseisnoeG,ta dna ntaetpm tah sebnem da eotr leaeesi tsuni g aacllo htret ah nCOSIseisnoeRelsa.e
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
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.