I need some help to learn this project

[Desperado6]

Hello sir, it is my honor to study your project.
When I run the program, in the [_on_step()] function of EvalLogCallback,
eval_ Envs: List [StatsWrapper]=self. local ["callback"]. eval_ Env. envs
This line of code shows that there is no "callback" variable name . I want to know if the monitor file is missing any content.
I am looking forward to your reply very much.

[pengxiaoywan]

Expected type 'Union[Env, VecEnv]', got 'StatsWrapper' instead ,how to fix it