QTR-Quadtone RIP

I just joined and downloaded QTR. After setting up and trying to print 
my first B&W TIFF to an epson 1280 printer I get ann error message that 
says "Quadtone RIP front end-Floating point division by zero" when I 
try to load an image.

Any help to suggest what is causing or how to help would be appreciated.

Don Frederick