ORA-06579: Bind variable not big enough to hold the output value
Cause : The bind variable specified by the user is not large enough to hold the output returned by the function or a procedure.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Specify a bind variable of larger size.
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.