I’m just getting started with HFSS; when I try to import Gerbers, I get this error message (see screenshot below), and the Messages (details) tell me something like “Could not find a valid signal layer” or something along those lines.
I suspect that I’m most likely doing something wrong on the HFSS side; but I wonder: is there something about KiCAD-generated Gerbers that HFSS doesn’t like? or perhaps some attributes that I need to specify in the project or in the boards settings that causes some missing attributes in the Gerber? (attributes that HFSS expects and requires?)