ORA-30511: invalid DDL operation in system triggers
Cause : An attempt was made to perform an invalid DDL operation in a system trigger. Most DDL operations currently are not supported in system triggers. The only currently supported DDL operations are table operations and ALTER?COMPILE operations.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Remove invalid DDL operations in system triggers.
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.