ORA-19254: XQ0034 - too many declarations for function string
Cause : The query module contained more than one function, either declared or imported, which have the same expanded QName.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Remove the duplicate function definitions.
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.