[Bug Report] Incompatible with mujoco 3.0.0

[bennevans]

Describe the bug

When using mujoco 3.0.0 and gym version 0.29, human rendering crashes the code with the following error:

AttributeError: 'mujoco._structs.MjData' object has no attribute 'solver_iter'

It has to do with the change in names described here

Code example

import gymnasium as gym
env = gym.make("Hopper-v4", render_mode="human")

observation, info = env.reset(seed=42)
for _ in range(1000):
    action = env.action_space.sample()
    observation, reward, terminated, truncated, info = env.step(action)
    env.render()
    if terminated or truncated:
        observation, info = env.reset()
env.close()

System info

Installed via pip version 0.29.1

Distro information
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Codename: jammy

Python 3.11

Additional context

No response

Checklist

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

[pseudo-rnd-thoughts]

Thanks for reporting, a PR has already been opened to fix this, #746

[Kallinteris-Andreas]

downgrade to 2.3.* in the meantime

[MohammedBadra]

Changing to solver_niter also works!

[pseudo-rnd-thoughts]

This has been solved in #746

[qlan3]

I saw a similar error when using Swimmer-v4:

>>> import gymnasium as gym
>>> env = gym.make("Swimmer-v4")

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "~/python3.9/site-packages/gymnasium/envs/registration.py", line 802, in make
    env = env_creator(**env_spec_kwargs)
  File "~/python3.9/site-packages/gymnasium/envs/mujoco/swimmer_v4.py", line 170, in __init__
    MujocoEnv.__init__(
  File "~/python3.9/site-packages/gymnasium/envs/mujoco/mujoco_env.py", line 360, in __init__
    super().__init__(
  File "~/python3.9/site-packages/gymnasium/envs/mujoco/mujoco_env.py", line 72, in __init__
    self.model, self.data = self._initialize_simulation()
  File "~/python3.9/site-packages/gymnasium/envs/mujoco/mujoco_env.py", line 380, in _initialize_simulation
    model = mujoco.MjModel.from_xml_path(self.fullpath)
ValueError: XML Error: Schema violation: unrecognized attribute: 'collision'

Package versions:

gymnasium                0.29.1
mujoco                   3.0.0
mujoco-py                2.1.2.14

[pseudo-rnd-thoughts]

@qlan3 This was addressed in #746

[Kallinteris-Andreas]

@qlan3
you can pip install mujoco<3 or wait for gymansium==1.0.0 or use the git version of gymnasium

[khoikhtn]

can anyone help me with changing solver_iter to solver_niter in vscode?

[Kallinteris-Andreas]

@khoikhtn #749 (comment)

[MatthewGerber]

@qlan3 you can pip install mujoco<3 or wait for gymansium==1.0.0 or use the git version of gymnasium

Thanks for clarifying the issue above! When do you anticipate releasing 1.0.0?

[pseudo-rnd-thoughts]

@qlan3 you can pip install mujoco<3 or wait for gymansium==1.0.0 or use the git version of gymnasium

Thanks for clarifying the issue above! When do you anticipate releasing 1.0.0?

Sorry, we have been wishing to release for a couple of weeks but due to everyone being volunteers and holiday and conference it could be at the end of January is my guess. Though main is very close to the final release most likely

[MatthewGerber]

@qlan3 you can pip install mujoco<3 or wait for gymansium==1.0.0 or use the git version of gymnasium

Thanks for clarifying the issue above! When do you anticipate releasing 1.0.0?

Sorry, we have been wishing to release for a couple of weeks but due to everyone being volunteers and holiday and conference it could be at the end of January is my guess. Though main is very close to the final release most likely

No apology needed. I appreciate your help on this project and look forward to the new release. The workaround listed above is working for now.

[Nourine-Nadir]

Describe the bug

When using mujoco 3.0.0 and gym version 0.29, human rendering crashes the code with the following error:

AttributeError: 'mujoco._structs.MjData' object has no attribute 'solver_iter'

It has to do with the change in names described here

Code example

import gymnasium as gym
env = gym.make("Hopper-v4", render_mode="human")

observation, info = env.reset(seed=42)
for _ in range(1000):
    action = env.action_space.sample()
    observation, reward, terminated, truncated, info = env.step(action)
    env.render()
    if terminated or truncated:
        observation, info = env.reset()
env.close()

System info

Installed via pip version 0.29.1

Distro information Distributor ID: Ubuntu Description: Ubuntu 22.04.3 LTS Release: 22.04 Codename: jammy

Python 3.11

Additional context

No response

Checklist

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

I tried this and it works,

1. uninstall both gymnasium and mujoco if already installed,

2. pip install mujoco==2.3.5
   then,

3. pip install gymnasium

This will automatically take care of compatibility. ✅