"do shell script" problem on tiger

You can reset the Spotlight Index under Tiger with the command line tool “mdutil”. I have try to do this with a script using “do shell script”:

do shell script "/usr/bin/mdutil -E /" with administrator privileges

I think “with administrator privileges” should run this code as admin (just like if i would type sudo as prefix in Terminal). This method has worked for me everytime, but not this time! I get the error: “Must be root to run mdutil!”. But in Tterminal and with sudo it works.

Does everyone know what Im doing wrong?

If you need to run as root (using sudo), then you may be out of luck. From the AppleScript release notes for Tiger:

and