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Error: ExperimentProcessDied

Hi,

I got errors like below:

"Error: ExperimentProcessDied

The experiment process seems to have died as the result of an unknown problem. This should not happen!

This error occurred in the unknown phase of item unknown.

An ExperimentProcessDied is raised when the experiment process died. This is generally the result of a bug in one of the underlying libraries that causes Python to crash. This should not happen! If you experinence this error often, please report it on the support forum."

This was happened when I run the experiment for only 4 to 5 trials. What can I do about this?

Best regards and Thanks!

Lawliet

Comments

  • Hi @Lawliet,

    Have you tried updating your version of OpenSesame yet? You can check and download the latest version (4.0) here: Download // OpenSesame documentation.

    If you already have the latest version installed, or if it doesn't solve your problem, could you please provide your experiment file?

    Claire

  • Hi @Claire,

    Yes, I have used the latest version. Attached is my experiment file.

    Thank you!

    Lawliet

  • Hi @Lawliet,

    Thanks, just wanted to make sure. The experiment seems to run perfectly fine on my machine, so as the error suggests, this may be indicative of deeper system-level conflicts rather than anything to do with your experiment script.

    Here are a set of possible solutions you could try out:

    1) Try running your experiment on a different machine to see if the problem is related to your current system configuration.

    2) You could check that all your Python libraries are up to date and compatible with your version of Python.

    3) Try different backends like legacy or xpyriment, if they are available, as different backends interact differently with system libraries.

    4) Try changing the runner from multiprocess to inprocess or external (Menu → Tools → Preferences → Runner). The multiprocess runner is usually recommended, but if you're having issues, others might work better in your situation.

    Please try these and let me know if you see any improvement.

    Claire

  • Hi @Claire,

    Thanks for your information. Yes, when I runned this experiment on another computer, no such error occurred. I have Psychopy and Anaconda as well as opensesame on this computer, which showed such error, is it because there is a conflict between these applications?

    Best regards and thanks so much!

    Lawliet

  • Hi @Lawliet,

    Having PsychoPy, Anaconda and OpenSesame installed on your device shouldn't cause any problems per se - I have the same setup and everything runs fine. 

    However, on your current computer, did you install both PsychoPy and OpenSesame with Anaconda? If that's the case, and if you didn't create a separate Python environment for each, they may share dependencies, which could cause conflicts. You could try reinstalling OpenSesame outside of Anaconda using the standalone installation and see if that changes anything. 

    You could also try the other solutions I mentioned earlier, but other than that, it's hard to pinpoint the exact cause without more details...

    Let me know if you find something!

    Claire

  • Hi @Claire,

    Thank you. I install them without Anaconda. I tried "run experiment on the desktop with PyGame (legacy)", no such error occurred.

    Thanks for your patience.

    Best regards,

    Lawliet


  • It seems like the experiment process is crashing due to an issue with one of the libraries. You could try updating your libraries or check if you have enough memory available, as running out of memory can cause crashes. You might also want to try reducing the experiment load by using smaller batches. If the issue continues, check the logs or reach out to the support forum

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