Mujoco-py: LD_LIBRARY_PATH Error

[shubhomb]

Hello,
I repeatedly get the following error installing Mujoco on Ubuntu 18.04 LTS (Bionic Beaver):

Please add following line to .bashrc
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/shubhom/.mujoco/mjpro150/bin

however, my .bashrc file is updated with that and i f I echo $LD_LIBRARY_PATH I receive
:/home/shubhom/.mujoco/mjpro150/bin

[zhujiapeng]

same question

[huangjiancong1]

me too, i have add the true path of mjpro150/bin in the .bashrc flie, but when i import mujoco_py, it output error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/mujoco_py-1.50.1.56-py3.5.egg/mujoco_py/__init__.py", line 1, in <module>
    from mujoco_py.builder import cymj, ignore_mujoco_warnings, functions, MujocoException
  File "/usr/local/lib/python3.5/dist-packages/mujoco_py-1.50.1.56-py3.5.egg/mujoco_py/builder.py", line 468, in <module>
    cymj = load_cython_ext(mjpro_path)
  File "/usr/local/lib/python3.5/dist-packages/mujoco_py-1.50.1.56-py3.5.egg/mujoco_py/builder.py", line 68, in load_cython_ext
    _ensure_set_env_var("LD_LIBRARY_PATH", lib_path)
  File "/usr/local/lib/python3.5/dist-packages/mujoco_py-1.50.1.56-py3.5.egg/mujoco_py/builder.py", line 101, in _ensure_set_env_var
    var_name, var_name, lib_path))
Exception: 
Missing path to your environment variable. 
Current values LD_LIBRARY_PATH=
Please add following line to .bashrc:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/huang/.mujoco/mjpro150/bin

[zwfcrazy]

Did you guys run python with sudo? If this is true, sudo will change your current user settings to root settings, including environment variables.

[shubhomb]

I did that and it did not change the error. Any other suggestions?

[zwfcrazy]

What I meant was that you should not use sudo.
If you look at the source code, it is actually this line of code failed to get the correct LD_LIBRARY_PATH.

os.environ.get("LD_LIBRARY_PATH", "")

You may run this code elsewhere to see if it gives you the correct LD_LIBRARY_PATH.

What I found is the following,
When you add "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/shubhom/.mujoco/mjpro150/bin" to .bashrc, this environment variable is only valid to the current user. However, if you run the python script using sudo, the user is changed to the root user and the LD_LIBRARY_PATH of the root user is empty.

[morison1]

Same issue... someone for the rescue ?

[iSarmad]

same issue, anyone who found the fix?

[iSarmad]

So here is something that worked for me:

1. Do not use Sudo while opening your Python/ IDE, as LIBRARY_LD_PATH is empty for sudo user.
2. Instead always open your Python editor (PyCharm in my case) with ./pycharm.sh command without sudo.
3. Here is the key, even after updating bashrc, always close all terminals/ IDE and open again before running your IDE again. This should be done as even after updating bashrc, the IDE reads the old bashrc file which does not even exist anymore.

[shubhomb]

It's still not working for me. Anybody have another idea?

[coolKeen]

I solve it by installing mujoco_py without using sudo, try this:
sudo pip3 uninstall mujoco_py
pip3 install mujoco-py==1.50.1.56

[LiuWenzhang]

I have got the same problem when I did "import mujoco_py" in pycharm. I solved this problem by reinstall my Pycharm on linux.

[ssghost]

same question, no solution yet.

[machinaut]

Here's an example dockerfile installing mujoco-py and gym on ubuntu 18.04 https://gist.github.com/machinaut/b5a7c6719a30e9fbfd95c13d5e963b61

Without more information I don't know how to help with this error.

The python process you import mujoco-py in needs to have the environment variable (LD_LIBRARY_PATH) set to include the folder with the mujoco binaries.

In order to avoid crashes with difficult-to-understand bugs, we explicitly check for it before importing, and then print a warning with instructions useful to beginner users on how to fix it.

[smallguoan]

same problem, but I solve it by opening IDE(Pycharm) in terminal.
In terminal:
pycharm2018.3/bin/pycharm.sh

But I still have error by opening my IDE with icon on desktop

-------------After 10 minutes--------------
:) I solved this problem by adding LD_LIBRARY_PATH to /etc/proflie. Then I restart and reopen my IDE with icon on desktop, the error didn't appear.

[machinaut]

This issue has a bunch of different concerns, many from old versions.

Closing for now. If you see this error, please open a new issue! We now have a template that helps us get the information we need!

Thanks,
~Alex

[ZhengLiangliang1996]

Same issue here using spyder, and I solved it by opening it through Terminal.

[hzm2016]

I solve this issue, by adding "source ~/.bashrc" to ".profile"

[NoobHua]

1. this problem arise when you run it on terminal.

you should check your ~/.bashrc
Add

export LD_LIBRARY_PATH= /path/to/.mujoco/mjpro150/bin${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}
export MUJOCO_KEY_PATH= /path/to/.mujoco${MUJOCO_KEY_PATH}

and "source ~/.bashrc"

1. this problem arise when you run it on PyCharm.

you should check if it can run successfully on terminal at first.
if ok on terminal, then:

click Run -> Edit Configurations -> Environment Variables

Add

LD_LIBRARY_PATH /path/to/.mujoco/mjpro150/bin
MUJOCO_KEY_PATH /path/to/.mujoco

[seyeeet]

@hzm2016 > I solve this issue, by adding "source ~/.bashrc" to ".profile"

how ? what do you mean to .profile?