ORA-19117: invalid redefinition of predefined namespace prefix 'string'
Cause : The given predefined namespace was being redefined in a namespace declaration.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Remove the namespace declaration that redefines the predefined namespace prefix.
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.