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Second component stuck on 'Building experiment structure' (OSweb experiments)

Hi everyone,

I am running into trouble with linking two OSweb experiments in JATOS and I was hoping someone could help me. Specifically, the second component of my JATOS experiment won't launch and will stay in the first screen stating 'Building experiment structure'.

I have tried uploading the second component as an individual study. It has no trouble booting up then. This makes me think that something has gone wrong with merging the two OSweb directories. What I did was:

  • Exported both experiments in OS as a JATOS file.
  • Merged the two .zip directories by renaming the .html file of the second component and copy pasting it in the .zip file of the first component together with the Open Sesame file. I left the css, img and js folders untouched.
  • Uploaded the combined folder (containing two .html files and two OS files) in JATOS
  • In the JATOS environment: Added in a new, second component and linked the .html file belonging to the second component.

Anyone has an idea what could have gone wrong? I have worked with it last year and it worked like a charm then!


PS: I have also tried linking two mock experiments (the standard that OS opens with) with the above procedure. Same problem.

Comments

  • If you did the same thing before and it worked there might be something wrong with JATOS. Two questions:

    • Do you get any errors or warnings when you import the new study? (You said upload but I assume it's import?)
    • If you open the Developer tools, do you see any errors in the console when you start the second component?

    Best

    Elisa

  • Thanks for your reply! Regarding your points:

    • My bad, I meant 'import' like you said. I'm not getting any errors when importing.
    • I've opened up developer tools while trying to fire up the experiment and there's loads of errors, but this one seems to be unique to this experiment:

    Looks like something in the CSS or JS folders bricks the experiment? If it helps, I'm using version 3.5.4 of JATOS and the newest OS build (3.3.11).


    Best,

    Tom

  • Hi Tom,

    Did you copy the component's JSON input into the new study? OSWeb studies need it to run.

    Apart from this I can't see any error in how you merged both OSWeb studies - I would have done the same.

    Best,

    Kristian

  • Hi Kristian,

    Thanks for your reply! Are you saying I should copy paste the same JSON input from my first component into the same field in the second component? Looking at my working experiment from last year (which even had three components!), I left those fields blank at the time.

    In the mean time I've found a workaround: two seperate JATOS studies and using a jatos.endStudyAndRedirect call to move to the next one.

    I've done some further digging for this response and it looks like the problem is some interaction between my server's version and the OSweb version. When I revert back to an older version of OS and export the experiments in that version, it works again like it should.. I wish that crossed my mind before coding the workaround, oh well!

    Best,

    Tom

  • Hi Tom,

    In the mean time I've found a workaround: two seperate JATOS studies and using a jatos.endStudyAndRedirect call to move to the next one.

    That's another possibility, not the most elegant but if it works it works.

    Are you saying I should copy paste the same JSON input from my first component into the same field in the second component?

    From the original component from the original OSWeb study. I tried it on my local JATOS with two random OSWeb studies: merged them like you described. I got a similar error message as you got, but after I added the JSON input it vanished.

    I've done some further digging for this response and it looks like the problem is some interaction between my server's version and the OSweb version. When I revert back to an older version of OS and export the experiments in that version, it works again like it should.

    Maybe older OSWeb versions don't use the JSON input. I don't know that much about OSWeb ;)

    Best,

    Kristian

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