"Loading module was blocked because of a disallowed MIME type (“text/html”)"

[MJenko]

URL of experiment: https://run.pavlovia.org/jenkim9/cyberbinding/html/

Description of the problem:
When running my Builder experiment online, I see only a blank screen. Using F12, the console window gives 5 error messages, all saying “Loading module from … [location] … was blocked because of a disallowed MIME type (“text/html”)”. The locations are all "/html/lib/*-2020.js. In my html folder, there is no /lib/ directory, which might be causing the error. Below is an image of the errors I receive.

The experiment runs totally fine locally. It is fairly complex, with things like nested loops, uses .png image files and .wav audio files, and uses code components to do plenty of stuff including selecting which file to use. I’ve made sure that all files are referenced using a relative path (e.g., “Field.png”, without the full filepath).

I have played around with this for several hours now, and I can’t figure out how to solve the issue. Any help is greatly appreciated! I’m happy to provide more info if needed.

Thanks,
Michael

[Aliadelik07]

Try disabling your Ad Blocker…!

[thomas_pronk]

Two more suggestions:

• Export to the most recent version of PsychoPy (2021.1.2)
• Leave “output path” empty in Experiment Settings → Online

[dbryce]

We had the same issue with “disallowed MIME type” and setting the ‘Use PsychoPy version’ to 2021.1.2 (as suggested by Thomas) solved it. Thank you!

[k22j]

Hello, sorry for this graveyard shift but I’m having the same problem with running my experiment. Is using version 2021.1.2 still the only way to fix this?

[aysegul92]

Hello everyone. I have a similar issue related to this topic. I’m receiving an error when reading JSON files, which says, “Refused to execute script from ‘’ because its MIME type (‘application/json’) is not executable, and strict MIME type checking is enabled.” I’ve attached a screenshot of my error. Has anyone found a proper solution for why this is happening? I’m not running my experiment from PsychoPy; I’m using jsPsych in JavaScript.