AttributeError when running "python main.py --mode=train" command

Im getting an error when running "python main.py --mode=train" command. See below for for the full error traceback:
```
Traceback (most recent call last):
File "/Users/varunpanchal/Documents/Projects/FinRLMain/FinRL/finrl/main.py", line 152, in
raise SystemExit(main())
File "/Users/varunpanchal/Documents/Projects/FinRLMain/FinRL/finrl/main.py", line 71, in main
train(
File "/Users/varunpanchal/miniforge3/envs/finrlmain/lib/python3.9/site-packages/finrl/train.py", line 60, in train
trained_model = agent.train_model(
File "/Users/varunpanchal/miniforge3/envs/finrlmain/lib/python3.9/site-packages/finrl/agents/elegantrl/models.py", line 84, in train_model
train_and_evaluate(model)
File "/Users/varunpanchal/miniforge3/envs/finrlmain/lib/python3.9/site-packages/elegantrl/train/run.py", line 80, in train_and_evaluate
trajectory, step = agent.explore_env(env, horizon_len, False)
File "/Users/varunpanchal/miniforge3/envs/finrlmain/lib/python3.9/site-packages/elegantrl/agents/AgentPPO.py", line 89, in explore_one_env
return self.convert_trajectory(traj_list, last_done) # traj_list
File "/Users/varunpanchal/miniforge3/envs/finrlmain/lib/python3.9/site-packages/elegantrl/agents/AgentBase.py", line 260, in convert_trajectory
pre_item = self.traj_list[env_i][j]
AttributeError: 'AgentPPO' object has no attribute 'traj_list'

```

**To Reproduce**
Steps to reproduce the behavior:
1. run `python main.py --mode=train`

**Desktop (please complete the following information):**
- Device: MacBook with Apple Silicon
- OS: Mac OS
- Python: 3.9