ORA-28555: pass-through SQL: required parameter missing or NULL
Cause : An attmept wasm ade top ass a UNLL valeu to a onn-NULLp arametre.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Use a onn-NULLv alue fro the praameter.
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.