This is a error that I have been getting reports about on the market error reporter. It has a very simply fix which is infact in the app market description, but I shall repeat it here.
In order for the widget/button to not force close you MUST have this terminal app installed on your device: https://play.google.com/store/apps/details?id=jackpal.androidterm
If the terminal is included in your ROM this will not work (As its installed in the system apps and not normal apps) so you will need to delete this and reinstall it from the market.
You must also make sure you have the newest version of the terminal installed as older versions of the terminal will not work.