TypeError: Converting circular structure to JSON

[Jake_J]

URL of experiment:
My Gitlab Link

Description of the problem:

Hi,

I had a task that was running completely fine for multiple participants. A participant just reached out to me and informed me of an error at the end of the task. I ran the task myself and encountered the same error. This is bizarre since I did not modify the task whatsoever and the error arose without me modifying anything. The error is below and I have included a picture as well.

TypeError: Converting circular structure to JSON → starting at object with constructor ‘PsychoJS’ | property ‘_logger’ → object with constructor ‘Logger’ — property ‘_psychoJS’ closes the circle

Any recommendation on how to resolve or what to do next?

[Jake_J]

Update: I deleted my project and recreated it and pushed my code to the newly created project and now it’s working fine. I lost 17 participants but the task is working now. I don’t know what the issue was. If anything with PsychoPy or Pavlovia knows, that would be great!

[wakecarter]

Here’s a solution for a similar error

TypeError: Converting circular structure to JSON (...)

Hi @SaraCal, It seems like passing in the names of ‘cue1’ and ‘cue2’ when setting opacity for the rest of your stimuli inside of ‘fixation_cueRoutineBegin’ is causing the error. Could you please try passing in numeric values instead? If your intention is for eg. ‘cue1a_main’ to have the same opacity as ‘cue1’ as a result, you should be able to just use ‘cue1.opacity’ I believe. I hope that solves the problem, here to help if not.

and

TypeError when pressing any key at initiation of experiment

@pc1, this error has occurred because you set the text of a text component using a text component object, rather than actual text. In the PRACTRIAL routine, the text component called PRACtext_2 uses a text component called text. This has happened because a column in your conditions file matches the name of one of your text components. The easiest fix will be to change the name of your "text" text component to a unique name.

[Jake_J]

Hey— Thanks. I saw the first of those posts and it seems the issue suggests that it would be resolved if I found a variable that was named the same for two different variables right? But I couldn’t find anything like that.

Moreover, the issue was fixed when I completely deleted the project and recreated the project. Do you happen to have any explanation or thoughts on why that might be? It seems potentially incongruent or different with the above two issues and solutions if recreating the project resolved it right?