#51 generating toolpath error

[Anonymous]

Traceback (most recent call last):
File "C:\Python25\lib\site-packages\pycam\Gui\Project.py", line 4041, in generate_toolpath
self.model, toolpath_settings, callback=draw_callback)
File "C:\Python25\lib\site-packages\pycam\Toolpath\Generator.py", line 62, in generate_toolpath_from_settings
backend, callback)
File "C:\Python25\lib\site-packages\pycam\Toolpath\Generator.py", line 226, in generate_toolpath
callback=callback)
File "C:\Python25\lib\site-packages\pycam\Geometry\Model.py", line 683, in get_offset_model
new_groups = group.get_offset_polygons(offset, callback=callback)
File "C:\Python25\lib\site-packages\pycam\Geometry\Polygon.py", line 965, in get_offset_polygons
cleaned_line_groups = simplify_polygon_intersections(new_lines)
File "C:\Python25\lib\site-packages\pycam\Geometry\Polygon.py", line 875, in simplify_polygon_intersections
intersection, factor = line1.get_intersection(line2)
File "C:\Python25\Lib\site-packages\pycam\Geometry\Line.py", line 211, in get_intersection
candidates.append((x3, c.norm / a.norm))
ZeroDivisionError: integer division or modulo by zero