ORA-19754: error reading from change tracking file
Cause : An I/O error occurred while reading from the change tracking file.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
There will be other messages on the error stack that show details of the problem.
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.