Hi,
Had this a couple of days back. As I recall the problem was calling a command with invalid arguments. In my case I had a script and I was passing some job variables as arguments but I'd defined one of the variables incorrectly.
So if my script was intended to be called as "/usr/bin/myscript " but I then didn't define one of those group variables then it failed with the error you are seeing.
Cheers
Joe