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jspsych experiment stopped working with JATOS 3.5.6

edited September 1 in JATOS


I have a very basic experiment with jspsych that tried to get running with version 3.5.6 and now it shows errors in console log such as:

GET net::ERR_ABORTED 403 (Forbidden)


Refused to apply style from '' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

The experiment works fine with version 3.5.5 or earlier. Should I change something in my javascript code? Or there is a workaround for this?

This has happened in Windows 7 with chrome, while in the Mac seems to be working well.

Thank you,



  • Hi Alex,

    What happens if you try your study on or Both have version 3.5.6 too.



    Buy Me A Coffee

  • Hi Kristian,

    Indeed it works fine in It seems to me that my OS is blocking the executable permission of the jspsych library (even if I download a fresh new copy). I am trying to figure out why.



  • Strange! Spontaneously I come up with folder permissions ... but then why the difference between 3.5.5 and 3.5.6? Which OS do you run JATOS on?

    Buy Me A Coffee

  • edited September 2

    This has happened in Windows 7 and Windows 10. This is a local jatos installation. In the log files it says this :

    2020-09-02 13:14:18,088 [INFO] - c.p.StudyAssets - .viaAssetsPath: You tried to access the file chords_major_minor\jspsych-6.1.0\jspsych.js but it seems you have no access rights. Maybe this study was never started?

    And security permissions in Windows all seem to be correct. I have full control of the files.

    Did exactly the same procedure with jatos3.5.5 (download from, unzip, copied files from the jatos3.5.6 study_assets_root folder into this version, and run) and it works fine.

  • As a follow up. I tried running the Hello World experiment from the studies page and got the same error :

  • Hi Alex,

    I checked the Hello world example study under Windows and had the same problem as you: loading of files lead to 403s. Usually I work under Linux or Mac and only test on Windows. And during testing it must have slipped through. It is a bug I introduced in the last version (3.5.6) that only affects JATOS running on Windows (using JATOS GUI on Windows while the JATOS server runs on Linux/Mac is fine). The underlying problem is the different way Windows on one side and Linux/Mac deal with file path separation (\ or /). Anyway, I made a fix and released a new version (3.5.7). And this time I actually checked that it works on Windows ;) .



    Buy Me A Coffee

  • edited September 17

    Hi Kristian!

    Awesome! I just saw the last version and indeed it works! Usually users work on their computers locally before uploading to the server, and there is many people using Windows machines. Thanks a lot!



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