Install opensesame on ubuntu with anaconda

julia_m

Hi everyone,

I'm currently struggling to install opensesame on ubuntu using anaconda, and I don't understand the error message I have. You will find below the error message, what I've done so far and all the packages currently installed.

Error message :
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/multiprocessing/spawn.py", line 105, in spawn_main
exitcode = _main(fd)
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/multiprocessing/spawn.py", line 114, in _main
prepare(preparation_data)
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/multiprocessing/spawn.py", line 225, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/multiprocessing/spawn.py", line 277, in _fixup_main_from_path
run_name="__mp_main__")
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/runpy.py", line 263, in run_path
pkg_name=pkg_name, script_name=fname)
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/runpy.py", line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/volatile/opt/anaconda3/envs/opensesame-py3/bin/opensesame", line 6, in <module>
from libqtopensesame.__main__ import opensesame
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/site-packages/libqtopensesame/__main__.py", line 29, in <module>
multiprocessing.set_start_method('spawn')
File "/volatile/opt/anaconda3/envs/opensesame-py3/lib/python3.7/multiprocessing/context.py", line 242, in set_start_method
raise RuntimeError('context has already been set')
RuntimeError: context has already been set

So here is what I've done so far (followed the download instructions from this page https://osdoc.cogsci.nl/3.3/download/, and ran some other lines after seeing the errors) :

conda create -n opensesame-py3 python=3.7
conda activate opensesame-py3
conda config --add channels cogsci --add channels conda-forge
conda install python-opensesame opensesame-extension-osweb opensesame-plugin-psychopy psychopy rapunzel python-pygaze
pip install soundfile pygame yolk3k opensesame-extension-osf python-qtpip http://files.cogsci.nl/expyriment-0.10.0+opensesame2-py3-none-any.whl
conda install PyQtWebEngine
conda install jupyter_client==7.4.4
pip install opensesame-plugin-media_player_mpy

I don't see what I'm doing wrong ?

Thank you so much in advance for your help

Julia

sebastiaan

Hi @Julia@julia_m ,

In general terms, what seems to happen is that OpenSesame tries to change the way that multiple processes are created by the application, but then crashes because this has already been done, and this is something that an application is only allowed to do once. The question is: how come that multiprocessing has already been configured by the time that OpenSesame tries to do it?

How do you execute OpenSesame exactly?

— Sebastiaan