I'm trying to export the layer "Balustrade Innen" in the attached file to a plotter but keep getting the message

Traceback (most recent call last):
  File "plotter.py", line 126, in <module>
    Plot().run()
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\base.py", line 140, in run
    self.save_raw(self.effect())
  File "plotter.py", line 63, in effect
    self.options.to_port(self.options.to_language(encoder.getHpgl()))
  File "C:\Program Files\Inkscape\share\inkscape\extensions\hpgl_encoder.py", line 100, in getHpgl
    self.process_group(self.doc, transform)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\hpgl_encoder.py", line 180, in process_group
    self.process_group(child, transform)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\hpgl_encoder.py", line 188, in process_group
    self.process_path(new_elem, transform)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\hpgl_encoder.py", line 201, in process_path
    path = node.path.to_absolute()\
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\paths.py", line 1299, in to_superpath
    return CubicSuperPath(self)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\paths.py", line 1331, in __init__
    self.append(item)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\paths.py", line 1368, in append
    item = item.to_curve(self._prev, pp)
  File "C:\Program Files\Inkscape\share\inkscape\extensions\inkex\paths.py", line 407, in to_curve
    raise ValueError("ZoneClose segments can not be changed into curves.")
ValueError: ZoneClose segments can not be changed into curves.

Oddly enough if I try to print to the plotter just this layer nothing happens. Addind a circle to that layer cuts the circle but not the white part.

What is going on here? What can I do?