关于生成mesh失败的问题

[yszddai]

[Open3D WARNING] Read PLY failed: number of vertex <= 0.
Traceback (most recent call last):
File "tools/extract_mesh.py", line 161, in
mesh()
File "tools/extract_mesh.py", line 94, in mesh
max_cluster_idx = np.argmax(count)
File "<array_function internals>", line 6, in argmax
File "/home/ysz/anaconda3/envs/jnerf/lib/python3.7/site-packages/numpy/core/fromnumeric.py", line 1195, in argmax
return _wrapfunc(a, 'argmax', axis=axis, out=out)
File "/home/ysz/anaconda3/envs/jnerf/lib/python3.7/site-packages/numpy/core/fromnumeric.py", line 54, in _wrapfunc
return _wrapit(obj, method, *args, **kwds)
File "/home/ysz/anaconda3/envs/jnerf/lib/python3.7/site-packages/numpy/core/fromnumeric.py", line 43, in _wrapit
result = getattr(asarray(obj), method)(*args, **kwds)
ValueError: attempt to get argmax of an empty sequence

按照官方例子运行extract_mash.py出现上述问题，这是什么导致的？open3d的版本吗？