error when train datasets

[Pyxel0524]

HI,thanks for your work!
when i train as the guide.
i run python main.py --mode=cluster --arch=vgg16-12 --pooling=netvlad --density_L=10 --num_clusters=64
it's ok
and then i run python main.py --mode=train --arch=vgg16-12 --pooling=netvlad --density_L=10 --num_clusters=64
find the error

Traceback (most recent call last):

File "D:\Study\Code\github\SLAM\VPR\MultiRes-NetVLAD-main\main.py", line 678, in
f.write(json.dumps({k:v for k,v in opt.items()}))

AttributeError: 'Namespace' object has no attribute 'items'

can u help me? thanks o lot