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Cannot open saved experiment without it crashing (repeating error messages) - wrapped C/C++ object


I thought I had my experiment all ready to go, just wanted to add underline to some text in a form_text_display. I didn't look up how to do that in python, but instead wrote <u> in front of the text, expecting to also write </u> behind it. Before I got a chance to do that though, I got the following error message:

When I clicked Dismiss, I just got another one right away and then another one and another one.. and so on until they were almost appearing too quickly for me to clear them. I closed the experiment without saving the changes, figuring it would work upon restart. It did not. When I open the experiment it takes a few seconds and then starts bombarding me with these again. I tried disabling the bug_report but that resulted in the program crashing instead. I tried quickly deleting the form_text_display upon opening, which first gave me a new error message:

but this was then followed by the original error messages again.

I checked the script and the <u> was no longer there so it didn't accidentally automatically save. Maybe that wasn't the cause after all..?

Basically, I have no idea what's going on, nor how to fix it. Can anyone please help?

Eternally grateful in advance,



  • Hi @Tina ,

    It's not obvious to me where this error comes from. Is it specific to this experiment, or do you also experience this error when working on other experiments? If it's specific to the experiment, could you attach the experiment file here (or send it to me by DM and then we continue on the public forum)?



    Buy Me A Coffee

  • Hi @Tina ,

    Thanks, I received the experiment and I can reproduce the crash. So that's good, and I'll see if I can trace it down.

    — Sebastiaan

    Buy Me A Coffee

  • If you go to Menu → Tools → Plugin and extension manager, then you can disable the preload_items extension (and restart OpenSesame). That should resolve the issue (which I don't really understand yet) for now.

    Buy Me A Coffee

  • That worked, thank you! Let me know if you manage to figure out what caused it so that I know to avoid it in the future (and in case the preload_items is useful) :-)


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