Wondering if you tested this at all?
Here is some more info I discovered. When ALL of the users from the cmd line are logged in when the SiteKill.exe runs, I don't get the error.
However I DO get the error when I run it like this
Code:
..\scripts\SiteKill.exe silent "idletime>600" user!=sitebot user!=eger user!=iogui
and say, only 1 or 2 of these users are logged in. I am going to try without the silent param and see if the error happens again.