You do a quick demo for the folks at Head-Ex and, even though the program works, it's not quite what they need.
The error message is more visible than when it was appearing in the Python Shell, but it isn't a whole lot more visible. Sure, you've proved that you can spot when an error happens and then run an exception handler in order to do something about the error. But you really need to do something that will interrupt the user and highlight the situation. You need something that will force the user to acknowledge the error before he continues doing something else.
A GUI message box might do the trick.
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