Hello,
I’m getting the same error at the moment. Works fine in Psychopy. Have checked the image files and uploads all seem fine and are in /png format. They the same images have worked fine for me on another online Pavlovia experiment, so in my case not an issue with the files. For me the error changes with the resource specified changing (e.g. sometimes img 5 sometimes img 6 etc) suggesting some sort of general loading error? Very appreciative of any suggestions. Clearing cache and running using incognito don’t fix the issue. Is it possible to have too many or too large image files? Or too many nested loops?