[Grml] Error running grml2usb

I am trying to use grml2usb to create a bootable thumb drive. I'm running debian trixie. I formated a 32Gb thumb drive with a single, primary FAT32 partition. Then I ran this command with the results shown:

# grml2usb grml-full-2024.12-amd64.iso /dev/sdb1 Executing grml2usb version 0.20.3 Fatal: expected str, bytes or os.PathLike object, not list

I believe that error message is a python error message, not something from grml2usb.