Hi Kevin -
As the error message indicates, it seems to be a problem with your TCL script. Can you run this guy independently of your LabVIEW program? Can you run any TCL scripts? I would try to trim down the current script to its simplest form and work your way back. There are several posts on DevExchange (exchange.ni.com) about using TCL & LabVIEW together,
you might want to follow their suggestions. There is nothing incorrect about your approach, System Exec literally hands over operation directly to the OS.
good luck
ben schulte
national instruments