ORA-06756: TLI Driver: cannot open oratab
Cause : The TLI server could not open the file used to define the locations of remotely accessible databases.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Ask your system administrator to check that the file exists and has the correct permissions.
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.