mujoco.FatalError in Ubuntu 18.04.5

[hydro-man]

when i run memory_maze i met a Error below: /home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/glfw/__init__.py:912: GLFWError: (65544) b'X11: The DISPLAY environment variable is missing' warnings.warn(message, GLFWError) /home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/glfw/__init__.py:912: GLFWError: (65537) b'The GLFW library is not initialized' warnings.warn(message, GLFWError) Traceback (most recent call last): File "/home/DQC/demo/test.py", line 4, in <module> env = gym.make('dmc_memory_maze:MemoryMaze-9x9-v0') File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/gym/envs/registration.py", line 640, in make env = env_creator(**_kwargs) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dmc_memory_maze-0.2.0-py3.7.egg/dmc_memory_maze/__init__.py", line 17, in _make_gym_env dmenv = dm_task(**kwargs) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dmc_memory_maze-0.2.0-py3.7.egg/dmc_memory_maze/tasks.py", line 25, in memory_maze_9x9 return _memory_maze(9, 3, 250, **kwargs) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dmc_memory_maze-0.2.0-py3.7.egg/dmc_memory_maze/tasks.py", line 105, in _memory_maze strip_singleton_obs_buffer_dim=True) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/composer/environment.py", line 331, in __init__ delayed_observation_padding=delayed_observation_padding) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/composer/environment.py", line 221, in __init__ self._recompile_physics_and_update_observables() File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/composer/environment.py", line 243, in _recompile_physics_and_update_observables self._observation_updater.reset(self._physics_proxy, self._random_state) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/composer/observation/updater.py", line 165, in reset enabled.observation_callable()) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/composer/observation/observable/mjcf.py", line 273, in get_observation render_flag_overrides=self._render_flag_overrides) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/mujoco/engine.py", line 220, in render scene_callback=scene_callback) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/mujoco/engine.py", line 694, in __init__ if self._physics.contexts.mujoco is not None: File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/mujoco/engine.py", line 525, in contexts self._make_rendering_contexts() File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/mujoco/engine.py", line 511, in _make_rendering_contexts mujoco_context = wrapper.MjrContext(self.model, render_context) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/mujoco/wrapper/core.py", line 606, in __init__ ptr = ctx.call(mujoco.MjrContext, model.ptr, font_scale) File "/home/DQC/anaconda3/envs/test/lib/python3.7/site-packages/dm_control/_render/executor/render_executor.py", line 136, in call return func(*args, **kwargs) mujoco.FatalError: an OpenGL platform library has not been loaded into this process, this most likely means that a valid OpenGL context has not been created before mjr_makeContext was called

[saran-t]

The relevant error message is right at the top of your paste: GLFWError: (65544) b'X11: The DISPLAY environment variable is missing'

Most likely culprit is that you're trying to render something over SSH without X forwarding using GLFW. If that's the case, setting MUJOCO_GL=egl might help if you have an Nvidia card.

[hydro-man]

The relevant error message is right at the top of your paste: GLFWError: (65544) b'X11: The DISPLAY environment variable is missing'

Most likely culprit is that you're trying to render something over SSH without X forwarding using GLFW. If that's the case, setting MUJOCO_GL=egl might help if you have an Nvidia card.

Thank you for your answering. I want to know where to setting 'MUJOCO_GL=egl' , by configuration file? And I also find when I run this code directly in my server instead of using VSCODE remoting development, this Error will not emerge ，I want to know why.

[kevinzakka]

@hydro-man Just prepend your bash command with MUJOCO_GL=egl.

[RayYoh]

The same error, but useless.

[dinghongsong]

Boys i got the solutions! Try to use X Virtual Framebuffer for simulating display environment.

Remember to unset the MUJOCO_GL env variable when using xvfb!!!

For example, run the following commands and it works:

xvfb-run -a python train.py --domain_name cartpole --task_name balance --encoder_type pixel --decoder_type pixel --action_repeat 4 --save_video --save_tb --work_dir ./log --seed 1

[RayYoh]

MUJOCO_GL=egl

Thx for your reply. I add MUJOCO_GL=egl in my .bashrc, and it works.