#80 Contour follow crash or not working

[Alfredo Rodriguez]

Hi, I'm trying the contour follow strategy with some STLs and is not working properly or crashes. I attach some sample files.
The one named "prueba presicion 01.stl" works fine, the one named "pedal2no.stl" starts but time remaining keeps going up and never ends.

The one named "prueba.stl" crashes and causes the following error message:

An unexpected exception occoured: please send the text below to the developers of PyCAM. Thanks a lot!
Traceback (most recent call last):
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.Gui.Project", line 4041, in generate_toolpath
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.Toolpath.Generator", line 62, in generate_toolpath_from_settings
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.Toolpath.Generator", line 372, in generate_toolpath
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.PathGenerators.ContourFollow", line 258, in GenerateToolPath
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.PathGenerators.ContourFollow", line 267, in GenerateToolPathSlice
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.PathGenerators.ContourFollow", line 310, in get_potential_contour_lines
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.Utils.threading", line 644, in run_in_parallel_local
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.PathGenerators.ContourFollow", line 57, in _process_one_triangle
File "pyinstaller\build\pyi.win32\pycam\outPYZ5.pyz/pycam.PathGenerators.ContourFollow", line 441, in get_collision_waterline_of_triangle
AttributeError: 'NoneType' object has no attribute 'cross'

Have a nice day