Error When Training Agent

When training the agent using the FinRL, I keep getting the same error that the tensor position must be a tuple not map, and not quite sure how to address the issue?

I am using a Google Collab on Mac.
ERROR:

TypeError Traceback (most recent call last)
[](https://localhost:8080/#) in
13 erl_params=ERL_PARAMS,
14 cwd='./papertrading_erl', #current_working_dir
---> 15 break_step=1e5)

4 frames
[/usr/local/lib/python3.7/dist-packages/elegantrl/agents/AgentBase.py](https://localhost:8080/#) in convert_trajectory(***failed resolving arguments***)
286
287 '''stack items'''
--> 288 traj_state = torch.stack(traj_list1[0])
289 traj_action = torch.stack(traj_list1[3])
290

TypeError: stack(): argument 'tensors' (position 1) must be tuple of Tensors, not map