Slic3r and ThreeDubber issue on Jr

I've been experimenting with Slic3r and running the gcode file through ThreeDubber.  I'm having a problem I think is related to how the header is populated in ThreeDubber.  There's a line "total_layers" that, I think, ThreeDubber is setting very low.  When I try running the .3w file, my print will only get partially through.  It will suddenly stop printing and display "spool error".  I need to cycle power to clear the error and print again.

I noticed that if I edit the file in XYZ Advanced Mode so the number of layers is higher, the print will complete without this error.  I haven't been patient enough to try multiple tries to see how closely the error times to the actual number of layers.  I'm sure with the value in the .3w set to "1", I wasn't getting more than 10 layers printed before the error would occur.

Has anyone else run into a problem like this?