PrusaSlicer error slicing antlers

I had no problem slicing birdfeeder_40_body.STL to gcode with PrusaSlicer 2.2.0

But when I try to slicer the antlers, I get the following:

Empty layers detected, the output would not be printable.
Object name: birdfeeder_40_antlers_1.STL
Print z: 2.200000
This is usually caused by negligibly small extrusions or by a faulty model. Try to repair the model or change its orientation on the bed.

I've tried File > Repair STL File and but the resulting OBJ file returns the same error.

Also tried moving the model around, scaling to 105%.

Any ideas? I'll try using Simplify3D next.