KeyError: "terminal_observation" in dqn.py

[Jackory]

Problem Description

when I run cleanrl/dqn.py, an error occurred：
in line 174：

My package version is here:
torch==1.7.1
gym==0.18.3
stable_baselines3==1.10

[vwxyzjn]

Please use the latest gym. Our master pins gym==0.23.1.

To avoid having this problem I also suggest using poetry install. See https://docs.cleanrl.dev/get-started/installation/

Feel free to re-open this issue if you still have trouble.