AttributeError: 'NoneType' object has no attribute 'load_model'

[TaocsZhang]

Hello,

I am trying to implement a task with my model and dataset, and i implement it following the example provided in quickstart (https://nvidia.github.io/NVFlare/examples/hello_pt.html).

Here is the error!
Traceback (most recent call last):
File "<nvflare-0.1.4>/nvflare/private/fed/server/sai.py", line 411, in start_server_training
File "<nvflare-0.1.4>/nvflare/private/fed/server/fed_server.py", line 793, in start
File "<nvflare-0.1.4>/nvflare/private/fed/server/server_model_manager.py", line 113, in initialize
AttributeError: 'NoneType' object has no attribute 'load_model'

Anyone knows how to solve it?
Thanks!