there is a issue when i use python train

[whn981841576]

i have a issue. while i use python train.py,there will be error in legged_gym/utils/helpers.py
model=models[-1]
"indexerror:list index out of range"
how can i fix it?
I looked at helpers and legged_gym and found that it may be caused by not adding extra parameters when I entered the train.py, maybe I should add task, checkpoint, etc. at the end, if anyone can know how to train and reproduce this paper, I hope to say how exactly it should be trained?