LogonAsUser question

[Guess_Who344]

Trying to logon locally.....Why won't this work?  Doesn't logon and I get the Fatal Error message every time.....   user exists, in local administrators group, correct password....       use Win32; use Win32::AdminMisc;   $Admin = "superman"; # Put here the name of an administrator $Passw = "superman"; # Put here his password   if(! Win32::AdminMisc::LogonAsUser( "",$Admin,$Passw)) { die "Fatal Error - Tell the Administrator\n"; }