Problem with File Field

I created a form with a file field, the form works fine as long as I fill in all of the fields. But if I leave the file field empty I get what appears to be a validation error (a red violation box at the top of the form) and no text.
[attachment=0]screenshot.1.jpg[/attachment]

Joomla Vers: 1.5.22
ChronoForms: V 3.2

Here is a backup of the form.

Hi,

Yes, there is a bug, here is the fix patch:
http://chronoengine.com/forums.html?cont=posts&p=60769#p60769

Regards,
Max