prepare_kitti_data.py error

I am follow the issue paper writtend as the IE Address:
https://github.com/NVIDIA/DIGITS/blob/master/examples/object-detection/README.md
But I get a big problem.
terminal show as follow :

(help) @MS-8CC99:~/digits/examples/object-detection$ ./prepare_kitti_data.py
Extracting zipfiles ...
Unzipping data_object_label_2.zip ...
Unzipping data_object_image_2.zip ...
Unzipping devkit_object.zip ...
Calculating image to video mapping ...
Splitting images by video ...
Traceback (most recent call last):
  File "./prepare_kitti_data.py", line 189, in <module>
    use_symlinks=(not args.no_symlinks),
  File "./prepare_kitti_data.py", line 78, in split_by_video
    for old_image_fname in os.listdir(os.path.join(training_dir, 'image_2')):
OSError: [Errno 2] No such file or directory: 'kitti-data/raw/training/image_2'

Smoe nice guy help fix this ERROR environment.
Thanks you.

Try running the script as
./prepare_kitti_data.py --no-symlinks
and see if that fixes it.

I try but is not work. Can you find anyother way fix the problem.

Thanks you.