Error - undefined symbol: simAddLog

[guilhermecano]

Good afternoon! Yesterday I tried to instal the most recent version of PyRep, but it is not working. It seems to have a problem with simAddLog in both CoppeliaSim 4.0.0 and CopeliaSim 4.1.0. The package version and the error that appears when I am trying to import PyRep are presented below:

Name: PyRep Version: 4.1.0

Python 3.7.9 (default, Aug 18 2020, 06:22:45) [GCC 7.5.0] on linux

>>> from pyrep import pyrep
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/gui/Dsc/tools/PyRep/pyrep/__init__.py", line 6, in <module>
    from .pyrep import PyRep
  File "/home/gui/Dsc/tools/PyRep/pyrep/pyrep.py", line 3, in <module>
    from pyrep.backend import sim, utils
  File "/home/gui/Dsc/tools/PyRep/pyrep/backend/sim.py", line 2, in <module>
    from ._sim_cffi import ffi, lib
ImportError: /home/gui/Dsc/tools/PyRep/pyrep/backend/_sim_cffi.cpython-37m-x86_64-linux-gnu.so: undefined symbol: simAddLog

Does anyone know why this error occurs? Thank you!

[stepjam]

Looks like a PyRep - CoppeliaSim version mismatch. The version numbers should match up. Make sure that when you install PyRep, that LD_LIBRARY_PATH points to the correct CoppeliaSim version.

[guilhermecano]

I just verified again and yes, it is pointing to CopeliaSim 4.1.0 (rev 0 - Ubuntu 18).

export COPPELIASIM_ROOT=/home/gui/Dsc/tools/CoppeliaSim_Edu_V4_1_0_Ubuntu18_04
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$COPPELIASIM_ROOT
export QT_QPA_PLATFORM_PLUGIN_PATH=$COPPELIASIM_ROOT

I double-checked with cd $COPPELIASIM_ROOT and I also echoed the LD_LIBRARY_PATH, it seems ok. If it is not a common problem among PyRep users, there may be something wrong here. I will keep on trying to run it and maybe try it on another machine with Ubuntu 20.

[nanbaima]

Hey @guilhermecano,

I think I had this problem, and it was with sim_cffi I'm not sure now, but I've installed it on hard code (instead of pip install .) and I think it solves this problem. Maybe @refalguera had a similar problem as well.

[stepjam]

OK, and have you tried reinstalling PyRep (rerunning pip install .) ?

[refalguera]

Hey @guilhermecano,

Try using python 3.7.7, with this version of python my cffi related problems have stopped. If it doesn't work, try installing PyRep using python setup.py install, it worked for me.

[guilhermecano]

@stepjam Yes, I tried with both pip install -e . and python setup.py install, but I still got the same error. I guess will try it on another PC to ensure there is nothing wrong with my python version, my pc, or the way I installed it.

[guilhermecano]

@refalguera Thanks. I will try it :)

Edit: It worked when installed in python 3.7.7. Thanks, Re!