train issue, please help me

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?

@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