Got "undefined symbol" When Importing suite

[Hwhitetooth]

Hi, there!

I followed the installation instructions and installed the package successfully. But when I did from dm_control import suite, I got an error like this:

>>> from dm_control import suite
WARNING: Logging before flag parsing goes to stderr.
W0103 17:33:16.675210 140177339770624 __init__.py:35] mjbindings failed to import mjlib and other functions. libmujoco.so may not be accessible.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/suite/__init__.py", line 28, in <module>
    from dm_control.suite import acrobot
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/suite/acrobot.py", line 26, in <module>
    from dm_control import mujoco
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/__init__.py", line 18, in <module>
    from dm_control.mujoco.engine import action_spec
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/engine.py", line 43, in <module>
    from dm_control.mujoco import index
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/index.py", line 94, in <module>
    from dm_control.mujoco.wrapper import util
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/wrapper/__init__.py", line 25, in <module>
    from dm_control.mujoco.wrapper.core import callback_context
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/wrapper/core.py", line 34, in <module>
    from dm_control.mujoco.wrapper.mjbindings import functions
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/wrapper/mjbindings/functions.py", line 22, in <module>
    mjlib = util.get_mjlib()
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/site-packages/dm_control/mujoco/wrapper/util.py", line 96, in get_mjlib
    return ctypes.cdll.LoadLibrary(_get_full_path(raw_path))
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/ctypes/__init__.py", line 429, in LoadLibrary
    return self._dlltype(name)
  File "/home/zeyu/anaconda3/envs/mujoco/lib/python3.5/ctypes/__init__.py", line 351, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /home/zeyu/.mujoco/mjpro150/bin/libmujoco150.so: undefined symbol: __glewBlitFramebuffer

I tried to test Mujoco independently by runing $HOME/.mujoco/mjpro150/bin/simulate and it worked well.
My OS is Ubuntu 16.04 and I am using Python 3.5.4.
Can anyone help me with this?

Thanks a lot!

[saran-t]

Hi, I just ran into this myself. If you have an Nvidia graphics card, a workaround for the time being is:

First, make sure that you have GLFW and GLEW installed: sudo apt-get install libglfw3 libglew2.0

Then, preload GLEW and OpenGL into the Python process. This can be done by running: LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGLEW.so.2.0:/usr/lib/nvidia-381/libGL.so python (replacing nvidia-381 with the version installed on your own machine as appropriate, you can run nvidia-smi to determine the driver version currently in use).

Do not set the LD_PRELOAD environment variable globally in your shell, though!

EDIT: More generally, run ldd $(which glxinfo) | grep libGL.so to find the path to the correct libGL.so file. Use that path in the LD_PRELOAD above, instead of the nvidia-381 path.

[Hwhitetooth]

@saran-t Thanks for your reply! And your solution works perfectly, though I am not using a Nvidia card.
Do you know why preloading is necessary?

[foolyc]

@saran-t I follow your solution, and it not works for me.

[efagerho]

This didn't quite work for me on Ubuntu 16.04 LTS, but the following works:

sudo apt-get install libglew-dev libglfw3-dev
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGLEW.so:/usr/lib/nvidia-384/libGL.so python

[blackvitriol]

@foolyc: try
sudo apt install mesa-utils ldd $(which glxinfo) | grep libGL.so LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGLEW.so.1.13:/usr/lib/nvidia-384/libGL.so.1

[anarkia7115]

@efagerho I follow your solution on ubuntu 16.04. It works! Thank you!

[yotam]

Hi all, we've pushed an update for this issue. Please let us know if this fixes it for you.

[ghost]

@saran-t @efagerho It works for me. Thank you!

[yotam]

@Hwhitetooth I'm going to mark this as resolved (see comment above) but if anyone still has this problem after trying the update, please comment and we'll reopen.

[tinyzqh]

I see the same problem, because the pycharm can't load the LD_LIBRARY_PATH of .bashrc.
I resolved this problem after starting PyCharm from the terminal.