KeyError: 'velodyne_path'

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I met this error when I run 'python tools/create_data.py kitti_data_prep --root_path=KITTI_DATASET_ROOT'
Traceback (most recent call last):
File "tools/create_data.py", line 95, in
kitti_data_prep("/home/LRH/SE-SSD/data/kitti")
File "tools/create_data.py", line 56, in kitti_data_prep
kitti_ds.create_reduced_point_cloud(root_path)
File "/home/LRH/SE-SSD/det3d/datasets/kitti/kitti_common.py", line 204, in create_reduced_point_cloud
_create_reduced_point_cloud(data_path, train_info_path, save_path)
File "/home/LRH/SE-SSD/det3d/datasets/kitti/kitti_common.py", line 162, in _create_reduced_point_cloud
v_path = pc_info["velodyne_path"]
KeyError: 'velodyne_path'
How to solve it?