reset() showing NotImplementedError for ObservationWrapper

[aswincs]

While using reset() Pong environment using ObservtaionWrapper, getting error:

File "/home/robot/.local/lib/python3.10/site-packages/gym/core.py", line 380, in reset
return self.observation(obs), info
File "/home/robot/.local/lib/python3.10/site-packages/gym/core.py", line 389, in observation
raise NotImplementedError

gym version: 0.26.2
evn = 'PongNoFrameskip-v4'

Any idea on fixing this issue?

Thanks

[pseudo-rnd-thoughts]

Could you provide a minimal example?
ObservationWrapper doesn't do anything by default.
You need to define the observation function, with many build in wrapper for different things

[aswincs]

Project:
https://github.com/aswincs/DeepQLearning_PhilTabor/blob/main/DQN/main_dqn.py

Error:
Traceback (most recent call last):
File "/home/robot/DeepQLearning_PhilTabor/DQN/main_dqn.py", line 30, in
observation = env.reset()
File "/home/robot/DeepQLearning_PhilTabor/DQN/util.py", line 104, in reset
observation = self.env.reset()
File "/home/robot/.local/lib/python3.10/site-packages/gym/core.py", line 380, in reset
return self.observation(obs), info
File "/home/robot/.local/lib/python3.10/site-packages/gym/core.py", line 389, in observation
raise NotImplementedError
NotImplementedError

[pseudo-rnd-thoughts]

https://github.com/aswincs/DeepQLearning_PhilTabor/blob/c954c3ae5146df4b87f0636633323c9fc994ff8d/DQN/util.py#L83C8-L89C27 is too indented
Therefore observation is not a function

[aswincs]

I couldn't fix this issue.

Is this issue because, for gym.ObservationWrapperdo we have to use custom observation