ORA-28577: argument string of external procedure string has unsupported datatype string
Cause : While transferring external procedure arguments to the agent, an unsupported datatype was detected.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Check your documentation for the supported datatypes of external procedure arguments.
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.