error: the type for the property "hole_fill" cannot be found about pcbmodelgen HOT 3 CLOSED

hole_fill is material property name used for drill holes and via holes. I think you needed to define it in simulation_script.m. You can try to add:

CSX = AddMaterial(CSX, 'hole_fill');
CSX = SetMaterialProperty( CSX, 'hole_fill', 'Epsilon', 4.2, 'Mue', 1, 'Kappa', 0, 'Sigma', 0, 'Density', 1 );

There are few materials names that are hard coded and used when generating octave scripts for geometry.
Now I don't exactly remember why I don't have hole_fill in examples, but I'll check it during next few days.

from pcbmodelgen.

but I'll check it during next few days.

Cool, thanks. Your answer was good enough to understand the context.

from pcbmodelgen.

Hole fill isn't in examples because there were no vias or drills. If you have vias or drills in your PCB just add definition for that material in your simulation script before line that imports kicad pcb:
CSX = kicad_pcb_model(CSX);

You can see that generated file kicad_pcb_model.m has lines like CSX = AddPolygon(CSX, 'metal_bot', 1, 2, -0.000000, p);

There are hard coded material names: box, pcb, metal_top, metal_bot, hole_fill.
Besides obvious ones box is for whole simulation space. This is used in case use_box_fill is set in pcbmodelgen.json

from pcbmodelgen.