I can not read the .obj file

[limaolin2017]

Traceback (most recent call last): File "extract_skel.py", line 473, in data, vox, surface_geodesic, translation_normalize, scale_normalize = create_single_data(mesh_filename) File "extract_skel.py", line 72, in create_single_data tpl_e = get_tpl_edges(mesh_v, mesh_f).T File "/root/autodl-tmp/camm/third_party/RigNet/gen_dataset.py", line 31, in get_tpl_edges neighbor_ids = np.concatenate(neighbor_ids, axis=0) File "<array_function internals>", line 6, in concatenate ValueError: need at least one array to concatenate