ORA-24325: this OCI operation is not currently allowed
Cause : An attempt was made to use a context handle outside its scope.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Verify that the context handle is set to a service context handle that has been converted to a logon data area for other OCI calls. The logon data area must be converted back to a service context before it can be used.
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.