[Bug Report] Hopper "global" XML error

[rickstaa]

Describe the bug

When trying to run the Hopper-v4 environment, I receive the following error:

ValueError: XML Error: global coordinates no longer supported. To convert existing models, load and save them in MuJoCo 2.3.3 or older
Element 'compiler', line 2

As explained in google-deepmind/mujoco#833, this is caused by an upstream change in the Mujoco library. For now, the best way to solve this is to pin Mujoco to version 2.3.3. I, however, wanted to open this issue to track the release of #589. Feel free to close this issue if you think this is unnecessary.

Code example

1. Install Mujoco v0.28.0.
2. Try to run the following code:

import gymnasium as gym

if __name__ == "__main__":
    env = gym.make('Hopper-v4', render_mode='human')

    env.reset()
    print("Testing Hopper-v4 environment.")
    for _ in range(1000):
        env.render()
        env.step(env.action_space.sample())

    env.close()
    print("Test finished.")

3. Be greeted by the error.

System info

Gymnasium install type: pip
Pip version: 23.1.2
Gymnasium version: 0.28.1
Mujoco version: 2.3.6
OS: Ubuntu 20.04
Python: 3.8.10

Additional context

Will be solved when #589 is released.

Checklist

• I have checked that there is no similar issue in the repo

[rickstaa]

Related to #572.

[pseudo-rnd-thoughts]

This has already been fixed in #589
We will hopefully have a release soon for everyone to use

[rickstaa]

For future reference. This was released under https://github.com/Farama-Foundation/Gymnasium/releases/tag/v0.29.0.

[Longyouyuan]

This has already been fixed in #589 We will hopefully have a release soon for everyone to use

but how to use the file to fix the problem?

[pseudo-rnd-thoughts]

This has already been fixed in #589 We will hopefully have a release soon for everyone to use

but how to use the file to fix the problem?

You should just need to use gymnasium v0.29.0