train issue, please help me

[hurong971013]

When I enter the command "python train.py --policy rgl ", it appears"
Traceback (most recent call last):
File "/home/hurong/RelationalGraphLearning-master/crowd_nav/train.py", line 6, in
import importlib.util
ImportError: no module named util"

I can't find this util package and can't import it, can you help me?

[ChanganVR]

@hurong971013 After a bit googling, it seems like you might be using the wrong python version. Are you using Python 2? Importlib only seems to work in Python 3