a bug happen when Processing the STEP data

[guozhengyue]

python -m pipeline.quickstart --dataset_dir s2.0.0 --num_workers 0
0%| | 0/35680 [00:00<?, ?it/s]
Traceback (most recent call last):
File "D:\aconda\envs\3DCSG\lib\runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "D:\aconda\envs\3DCSG\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "E:\3DCSGNET\BRepNet\pipeline\quickstart.py", line 84, in
num_workers=args.num_workers
File "E:\3DCSGNET\BRepNet\pipeline\extract_brepnet_data_from_step.py", line 939, in extract_brepnet_data_from_step
extract_brepnet_features(file, output_path, feature_schema, mesh_dir, seg_dir)
File "E:\3DCSGNET\BRepNet\pipeline\extract_brepnet_data_from_step.py", line 893, in extract_brepnet_features
extractor.process()
File "E:\3DCSGNET\BRepNet\pipeline\extract_brepnet_data_from_step.py", line 89, in process
coedge_point_grids = self.extract_coedge_point_grids(body, entity_mapper)
File "E:\3DCSGNET\BRepNet\pipeline\extract_brepnet_data_from_step.py", line 474, in extract_coedge_point_grids
coedge_grids.append(self.extract_coedge_point_grid(occwl_oriented_edge, faces))
File "E:\3DCSGNET\BRepNet\pipeline\extract_brepnet_data_from_step.py", line 494, in extract_coedge_point_grid
coedge_data = EdgeDataExtractor(coedge, faces, num_samples=num_u, use_arclength_params=True)
File "D:\aconda\envs\3DCSG\lib\site-packages\occwl\edge_data_extractor.py", line 45, in init
self.left_face, self.right_face = edge.find_left_and_right_faces(faces)
File "D:\aconda\envs\3DCSG\lib\site-packages\occwl\edge.py", line 365, in find_left_and_right_faces
assert face2.is_left_of(self)
AssertionError

why the AssertionError happen？