I’ve encountered the same problem when trying to use the Breakout environment in OpenAI Gym.

The issue arises because the environment name "Breakout-v0" is outdated or does not exist in the current version of Gym. In the latest versions, Atari environments have been updated with a new naming convention. Specifically, for the Breakout game, the environment name is now prefixed with "ALE/" and includes a version number at the end.

To resolve the error, you should modify your code to use the correct environment name:

import gym

env = gym.make("ALE/Breakout-v5", render_mode="rgb_array")

Make sure you have the Atari dependencies installed. You can install them using the following command:

pip install gym[atari, accept-rom-license]

For additional assistance and similar issues, you might find this StackOverflow thread helpful:

Getting an error trying to import environment OpenAI Gym