Issue converting CAD .stl to FLUKA .inp format

[HHEIOJ]

Hi everyone,

I'm currently working on converting CAD .stl files to FLUKA .inp format using the pyg4ometry library. However, I'm encountering an issue in the geant4PhysicalVolume2Fluka function.

firstly, I transform stl to gdml, then I try to tranform gdml to inp.
here are my codes:

stl_file_path = "/home/tree/pyg4/utah_teapot.stl"
gdml_file_path = "/home/tree/pyg4/ridgefilter.gdml"
outputFile="/home/tree/pyg4/test.inp"

world_material = "G4_AIR" 
solid_material = "G4_WATER"

#stl2gdml(stl_file_path, gdml_file_path,worldMaterial=world_material, solidMaterial=solid_material)
stl2gdml(stl_file_path, gdml_file_path)

reader = pyg4ometry.gdml.Reader("ridgefilter.gdml")
logical = reader.getRegistry().getWorldVolume()
freg = pyg4ometry.convert.geant4Logical2Fluka(logical)
w = pyg4ometry.fluka.Writer()
w.addDetector(freg)
w.write("FileName.inp")
extent = logical.extent(includeBoundingSolid=True)
f = pyg4ometry.fluka.Flair("FileName.inp",extent)
f.write("FileName.flair")

I got the wrong message:
lib/python3.12/site-packages/pyg4ometry/convert/geant42Fluka.py", line 275, in geant4PhysicalVolume2Fluka materialNameShort = flukaRegistry.materialShortName[materialName] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^ KeyError: 'G4_Au'

Could someone please guide me on how to resolve this issue?

Thank you in advance for your help!