ContextException: Unable to share contexts

science83

I am using Open Sesame for an experiment, measuring for accuracy and reaction times of participants' answers to some stimuli. I set up the experiment on my computer and I had no problem. Also, the experiment runs without stopping.

However, once I run the experiment on my assistant's computer, the following error message appears (see below). What could the problem be, given that both of us work with Windows 2007 and have installed the 3.0.X version of opensesame?

I am looking forward to hearing from you and thank you in advance for your help.

Stopped

The experiment did not finish normally for the following reason:

Unexpected error
Details

item-stack: ``
exception message: Unable to share contexts
time: Tue Feb 23 18:33:43 2016
exception type: ContextException
Traceback (also in debug window)

  File "dist\libqtopensesame\misc\process.py", line 140, in run
  File "dist\libopensesame\experiment.py", line 379, in run
  File "dist\libopensesame\experiment.py", line 723, in init_display
  File "dist\openexp\canvas.py", line 65, in init_display
  File "dist\openexp\_canvas\psycho.py", line 352, in init_display
  File "dist\psychopy\visual\window.py", line 330, in __init__
  File "dist\psychopy\visual\window.py", line 1412, in _setupGL
  File "dist\psychopy\visual\window.py", line 1273, in _setupPyglet
  File "dist\pyglet\window\win32\__init__.py", line 131, in __init__
  File "dist\pyglet\window\__init__.py", line 559, in __init__
  File "dist\pyglet\window\win32\__init__.py", line 263, in _create
  File "dist\pyglet\gl\win32.py", line 265, in attach
  File "dist\pyglet\gl\win32.py", line 210, in attach
ContextException: Unable to share contexts

sebastiaan

Hi,

A quick Google gives this results:

• http://stackoverflow.com/questions/28371628/pyglet-unable-to-share-contexts-exception-when-running-psychopy-demo-twice

The error is quite cryptic, and I'm not too familiar with OpenGL (perhaps @dschreij will know more), but it seems to be a problem with initializing the OpenGL window twice. (OpenGL being the library used for display control.)

So two questions:

• Does this error only occur after you run the experiment for the second time, or does it already occur on the first run?
• Are you using the inprocess runner (Menu → Tools → Preferences), and does the problem disappear if you switch to the multiprocess runner?

Cheers,
Sebastiaan

Ornella

Hi,@sebastiaan,

I'm experiencing the same problem. The exact same error occurs when running opensesame version 3.0.7 on a Windows XP 32-bit system in my lab! I'm using multiple runner and the programme won't start. Thanks for any help！

sebastiaan

Hi @Ornella ,

I don't know where this error messages comes from, to be honest. Quite possibly, it's related to the fact that you're using a very old version of OpenSesame on a very old version of Windows. My guess is that you're limited by the fact that your lab is running Windows XP so updating is not an option? If not, then I would try trying different runners and back-ends to see if there is a combination that works.

— Sebastiaan