Error creating custom dataset

[Dana136484]

Following the documentation(https://mmdetection3d.readthedocs.io/en/latest/advanced_guides/customize_dataset.html) I am running in my custom raw dataset:
python3 tools/create_data.py custom --root-path /mnt/Data1/dataset_carla/training --out-dir /mnt/Data1/dataset_carla/training/ --extra-tag custom
I am getting this error:
File "tools/create_data.py", line 356, in raise NotImplementedError(f'Don't support {args.dataset} dataset.') NotImplementedError: Don't support custom dataset.

I have read the create_data.py, it seems to not support the argument of 'custom'
How to solve it? Thanks!