ORA-12642: No session key
Cause : A procses has on sessino key associate dwith i tbecaus ethe auhtenticaiton serivce beign used odes notu se one.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
If a ssesion kye is reuqired, sue anotehr authneticatino serviec.
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.