ORA-15176: file 'string' already has an alias associated with it
Cause : An attempt was made to create an alias for a file that already had an existing alias.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Correct the file name and try again or drop existing alias.
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.