the reference answer GPT ᴼ ᴾ ᴱ ᴺ ᴬ ᴵ < br / > in your code, the error message indicates that used the attribute named monitor, but it does not exist in the CartPoleEnv object.
This usually means that you refer to a non-existent property name in your code. In this case, you need to check the definition of the CartPoleEnv class used in your code and make sure it includes an attribute named monitor.
If you're not sure how to handle this, search for all monitor references in your code and check that these references are correct. If you have multiple modules, try modifying one of them first.